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failed boot after removing battery

Q: failed boot after removing battery

I was working on an old computer for my son today. I forgot my password so I removed the battery to reset everything. When I replaced it the screen stays black. Everything appears to be operating on the inside of the case but my keyboard will not light up and my monitor stays in standby mode. Prior to removing the battery the computer ran fine.

Preferred Solution: failed boot after removing battery

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A: failed boot after removing battery

That indicates that the computer is not even reaching the POST stage of booting from the BIOS.

What else might you have disturbed while removing the CMOS battery?
Is there a tamper switch on the case that has been triggered? (a "feature" of a few older PCs)?

Is the battery reinstalled in the right manner?

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Inspiron 3442 will restart normally, but not hard boot unless the battery is drained. If the battery is not drained, it will only boot after removing the battery. Seems like a process still runs even after shutting down. Started to happen after installing windows 10.

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Hello everyone,
I have been having a problem with my laptop recently. A few weeks ago my laptop turned off, and wouldn't turn back on. I did some googling, and found suggestions to remove the memory, SSD, and CMOS battery, wait, then put them  back in and try again. When I did that, it didn't work the first few power button presses, but then it turned on. It has been consistent like that. I have the battery out, and on AC only, when I remove AC and CMOS battery, then plug the AC back in, the laptop will boot after hitting the power button a few times.

Any suggestions?

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I am dual booting Windows 10 and Linux (Ubuntu 17.10). I was on Windows 10 when I was updating my battery firmware using the Lenovo Battery Firmware Update Tool. It prompted me to update my battery and I confirmed and clicked next. Immediately, my screen turned black. I waited 10 minutes and then did a force shutdown on the computer by holding the power button. Now my battery won't charge. It is an official 55+ Lenovo battery and last week Ubuntu's acpi said that the battery was at 67% capacity and could run on battery for an hour and a half at full charge. Now all of a sudden, after the failed firmware update, my battery will not charge: whether the laptop is on in Windows 10, on in Ubuntu, or while the computer is turned off and plugged. When I do connect the AC cord the battery indicator blinks with a steady green, to a stready orange, to a rapid orange, and then off within a span of ~10 seconds. I have tried deleting the battery drivers on Windows and restarting and it does not work. I have also tried to update the battery firmware again using the Lenovo Update Firmware Tool but it repeatedly gives me the same error "The tool was unable to update the battery firmware due to an internal error." I have also updated to the latest BIOS to no avail.

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Hello, first all the facts: Model: Pavilion TS 11Year bought: 2013product Number: E2V68EA#ABDBattery test result: primary battery failed - replace (42)Error code: 0GF2MR - 6MW8H9 - XD7WXF - C0A503 The problem: I have noticed the very first time the battery did not fully charge up to 100% app. 1 1/2 years ago. Then it always stayed at about 75%. I made several battery tests, yet everything seemed to be fine. Two days ago, I noticed the battery was down to 7% - not charging even though it should be. I run some battery tests again and the error stated above suddenly came up. The HP battery test via the support center sated everything was okay, yet as I googled the primary battery failed message, I kind of got alarmed.  There is no warranty left and the touchscreen had to be disabled a couple of months ago, because it was not working properly as well. I hope for advises - does it actually make sense to try to repair it? Can this problem be repaired - as far as I understand, the primary battery means changing the removable battery won't help at all? Best wishes,Kristina 

A:battery test: primary battery failed - replace (42)

Hi,Replacing the main removable battery with a new battery preferably HP genuine battery is the solution to this.Manual: Page 27http://h10032.www1.hp.com/ctg/Manual/c03823315You need3-cell, 36-Wh, 3.20-Ah, Li-ion battery�, HP part number 729892-001�http://www.ebay.com/itm/281748237458?_mwBanner=1RegardsVisruth

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So, I tried to perform a "battery reset" from lenovo vantage on my Thinkpad Yoga 460. After approx 1 min, the process fails on the first step with an "unsuspected error"  And now my battery stays at 4% when plugged in, not charging.Same error if I repeat the process. Lenovo vantage says my battery is in good condition.There are no additional drivers or bios updates for me to download according to Vantage (i.e. I have latest versions of everything) Did vantage just destroy my battery?

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So, I tried to perform a "battery reset" from lenovo vantage on my Thinkpad Yoga 460. After approx 1 min, the process fails on the first step with an "unsuspected error"  And now my battery stays at 4% when plugged in, not charging.Same error if I repeat the process. Lenovo vantage says my battery is in good condition.There are no additional drivers or bios updates for me to download according to Vantage (i.e. I have latest versions of everything) Did vantage just destroy my battery?

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My battery was dying. I tried calibration, letting the lenovo run just on the battery. It looks like it went down to 0%, then shut off. But it wouldn't charge. It was probably never charging in the first place, always running off the power of the AC.  But I could still boot to AC. So I bought a new battery. It said to calibrate. So I tried that. The battery ran down to maybe 20%, then shut off. But the same result. Laptop will neither boot nor charge the batttery. Again, it will boot just fine with the battery out.  So, what's to be done? Also, I tried to get into the BIOS via F2 and F12, but that doesn't work either.  - Dan  

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 I have a Lenovo Yoga 720 laptop with Windows 10 installed. I was attempting to install Ubuntu 18.04 as a dual boot option. I was able to install Ubuntu, but encountered some difficulties in that during the boot up process, I was not seeing an option to choose between the two OSs. I had to press F12 manually and select from one of the choices to boot into either Windows 10 or Ubuntu 18.04. I think this was because I had installed Ubuntu in legacy mode, but later found out that I should have installed it in UEFI mode instead.To start over, I removed the Ubuntu partitions using the Disk Management application in Windows. Now when I boot, I either get an error and go into GRUB rescue (I tried Boot-Repair by loading Ubuntu using a live USB to no effect) or have to press F12 again, after which I go to the screen shown below. From there, I have to choose the second option to load Windows 10. How I can remove the first option from the Boot Manager, so that Windows loads automatically without choosing the 2nd option from the Boot Option Menu whenever I start my laptop? 

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I installed the latest round of Windows updates for my Win7 x64 install and it never completed (ran for about 24 hours) so I powered off the machine. Upon restarting, it said:

"Windows failed to start. A recent hardware or software change might be the cause" and has instructions for using system repair, then at the bottom:

File: \Boot\BCD
Status: Oxc000000f
Info: An error occurred while attempting to read the boot configuration data
So I booted off a Windows recovery disk and figured Startup Repair would fix it. Alas, after it says "Windows found problems with your computer's startup options" and asks me if I want to repair, I click "repair and restart" and it says "Failed to save startup options".

The "repair details" are:
Name: {bootmgr}
Identifier: {...}

The following options will be added:
Name: Windows Recovery Environment (recovered)
Path: Recovery\...\Winre.wim
Windows Device: Partition=D:
I've tried running Startup Repair from the manual options screen and it says it cannot repair automatically. I have two partitions, the 100MB windows System partition, which Recovery Console mounts as C:\ and my main windows partition, which it mounts as D: and I can see all of my files on it.

Running "bootrec /repairbcd" gives me "Total identified Windows Installations: 0"

I'm not sure if there might be something fishy with the way it's detecting my partition table... Read more

A:Windows 7 update failed and laptop won't boot. Startup repair failed

Have you run bootrec /fixmbr and bootrec /fixboot?
Then, if it doesn't boot, run bootrec /RebuildBcd (from this KB article: How to use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues in Windows )

c0000005 is STATUS_NO_SUCH_FILE - which means it can't find File: \Boot\BCD

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Hi  I have problem in my laptop lenovo yoga 520  "Default Boot Device Missing or boot failedInsert recovery media and hit any key Then select boot manager to choose a new boot device to boot or recovery media."  Cannot start windows 10  Thank you

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I have dual boot in my laptop with Ubuntnu 14.04 LTS and Windows 7 Home Premium 64 bit. Today after working on Ubuntu I restarted and switched to Windows and as soon as it logged in I noticed the battery was 0%. I thought maybe it was some kind of glitch or something (silly me!) so I just pulled the power supply and the laptop abruptly turned off. My laptop battery is completely dead now...won't charge at all and after that incident when I tried to log back into Windows it showed this error:

Windows failed to start. A recent hardware of software change might be the cause. To fix the problem:

1.Insert your Windows installation disc and restart the computer.
2.Choose your language settings, and then click "Next".
3.Click "Repair your computer."

If you do not have this disc, contact your system administrator or computer manufacturer for assistance.

Status: 0xc000000f

Info: The boot selection failed because a required device is inaccessible.

I don't have an installation disc, I tried pressing F8 and none of the options there helped. Ubuntu still works totally fine though. So I'm guessing it is not some hard drive crash and my data are fine in Windows but I just can't boot into it! Please Help!!

A:Dual Boot: Win7: Boot Manager Status: 0xc000000f boot selection failed

Are you using GRUB2 as bootmanager and is windows one of the options? Or do you start ubuntu from the win7 boot menu?

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My hp laptop had its battery flat for 12 hours. After that the laptop can nolonger boot up or charge. Please help

A:HP laptop cannot boot up or charge battery after battery went flat for 12 hours

What is the model of your laptop?

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I need to remove battery from motherboard - ASUS A7V8X=MX SE. Got a photo if that is of any help.

Is there a clip or something keeping it in place. dont want to damage mother board!!


A:Removing Battery

You should see a slot in the housing that holds the battery. My ASUS A7V8X kind of points down. If u use a small screw driver and lift on the battery, it should just pop out. I think thats how I R&R'd mine.


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Hello my Lenovo y50-70 battery died recently. I removed it. After removing battery i have really low fps in games. Can anyone give explanation to this?

A:Low FPS after removing battery.

I've seen this before, where removing the battery places the PC into a reduced performance mode.  Definitely replace the battery and it should return to normal. 

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Hi, I have got a problem with bluetooth device. I tried removing my bluetooth device but it failed to remove. It is displayed as "removing device" on the screen as shown in the picture. Now I cannot add the device again. I don't find the device when I search by clicking on "add a device" as shown in the picture. When I try to add from my mobile device it fails to add by showing a message as shown in the next picture.

A:removing bluetooth device failed

Same here. Windows 8.0 Remove Bluetooth device fails. Tried with device - external speaker off and on. Removed fails both ways.

So I have a zombie Bluetooth speaker that won't work, but cannot be removed either. Nice.

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Removing the battery from the motherboard, what will happen??? HELP HELP HELP!!!

what will happen if i will remove the battery from the motherboard and try to turn it on???

will it cause over heating to the cpu?? or will it cause the hard disk to fail to read anymore?

please help me urgent.


pm me or ym me

A:Removing the battery from the motherboard

No, there will be no permanent damage to anything, that'd be just silly.

The system will boot up using the factory settings for BIOS and/or complain about it. Usually you have to enter the BIOS setup or just confirm with a keypress.

I'd say with 90% probability the system will work just fine, although the clock will be wrong and the the default BIOS settings may not be the fastest. One'd have to manually set the clock and alter BIOS settings after every powerdown for best computing experience.

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I am trying to help someone remove the main battery from an HP Envy 14 -1000. I am doing this remotely from 1000 miles away and the person is not very mechanical.  On the bottom of the laptop there is a latch with the battery symbol. How far is that latch supposed to slide? Should it slide all the way over and cover the little battery graphic? It only seems to slide about 5mm. Also, once it slides, how does the cover or battery remove? What direction, does it pull up, or does it slide off? I could use some very specific instructions as it does not seem to be cooperating. Last question: Once we get it off, will there be a battery number on it? How do we figure out which battery we need?    

A:Removing battery from HP Envy 14?

The Maintenance & Service Manual gives pretty good directions for removing battery:http://h10032.www1.hp.com/ctg/Manual/c02835360 And, yes the battery should have a number on it.

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I have a strange issue regarding powering on my laptop. Every time I do clean shut down, I must remove the battery to be able to switch on my laptop again. When working on power supply only (with battery removed) I must unplug it and plug again to fix the issue. Everything works fine if I power off the computer using power button at any time, then I can just press power button and laptop switches on.Because this model come with FreeDOS pre-installed I'm currently using Arch Linux on it. I updated UEFI to latest available version F.79 but it didn't help.

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Till yesterday the battery showed no sign of possibility of failure. But today it won't start and showed red and white light. Only when provided with the AC supply , the laptop has turned on. The BIOS says it has permanent failure and needs to be replaced. How come all of a sudden ? HELP.

A:Battery permanently failed

Hi Shreyashi,
Thank you for reaching out to Dell Community Forum.
Can you try to update the BIOS to the latest version available from our Dell Support site?
Was there any recent software updates?
Do you have another battery to try?
Please private message us the service tag of the system along with your email id.
(Note: please don't mention the service tag or email id on the public forum as it contains your personal information).

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Dear Sir,I had purchased A laptop HP PAVALION M6 1002TX before 2.5 years,now before 6 month earlier my hinges have failed and my charger do not charge battery.I had replaced my hinges hence physical body is okbut the main problem is now that my charger do not charge my laptop,I checked my laptop after changing ac charger and battery but still problem presist, I showed my laptop to a good electronics shop, they told me that this problem cannot be resolved,I checked on internet that many more users of same laptop is facing both the same problems,what should I do,I love my lapy 

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lately when I boot up computer (pentium)
I get a message that -cmos battery failed-
To continue I have to press F1. Then Windows starts to boot, stops to let me put in the correct date, then continues to load Win 95.
When I boot up again, same messages.
Where can I buy a battery? and where is it located?
Should I remove the battery when I find it nad try to match it that way or are all batteries the same.
Confused and needs help.

A:cmos battery failed

They are located on the mother board and may look like a watch battery(disk)or like a small AAA battery and while some may be in holders, some older ones were soldered in place. If you feel comfortable doing it, with the power off, open up the computer and look for the battery. If it is in a holder, you should be able to replace it. If it is one that is soldered in place, it may need to be replaced by a professional repair person so as not to damage the MB when soldering in the new one.

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Hello Everyone and Happy Halloween. I've been trying to use my laptop on battery and it says battery charger failed. Do you think I need a new battery or is there something else. You help is appreciated.

A:Battery Charger failed

Could be the battery or the cord. This sounds akward but have you tried adjusting the power cable (moving it around wiggling it) sounds silly. But worth a shot! lol If you can try to use your powercord on another laptop- if it works you know its your battery and if the powercord doesn't work you just need to purchase a new cord.

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So i had a test environment where i was playing around with Active Directory and Child Domains. I have a domain and i created a child domain under that domain on an old server. Well it just so happened that the server had a serious hardware error and no longer runs.

How do i go about removing the child domain from the main domain controller? It is continuously filling up the Directory Service log because AD can't find and communicate with the failed child domain.

How do i remove it without having the failed server up. If it were up i could easy demote it but that server is toast.

Does anyone have any information on it? I have searched the web a bit and i haven't had much luck finding what i was looking for.

thanks everyone

A:Removing Failed Child Domain Controller

Here are MS instructions to manually remove a server from the AD:


It can be a little nerve racking if your not comfortable with console based commands; but I've done it on a couple of networks with great results. Best advice: ghost/image the server before you start... just in case.

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I followed all the steps found here - http://www.bleepingcomputer.com/virus-removal/remove-malware-protection-center - and MBAM says it removed it successfully... but when I try to install Avira, it detects traces of Malware Protection Center. Avira won't install because it conflicts with Malware Protection Center.

Then I followed the steps found here - http://www.bleepingcomputer.com/forums/topic34773.html - as well... Hope you can help. Thanks!

DDS (Ver_2011-08-26.01) - NTFSx86
Internet Explorer: 8.0.6001.18702 BrowserJavaVersion: 1.6.0_27
Run by butbans at 12:29:55 on 2012-01-27
Microsoft Windows XP Home Edition 5.1.2600.3.1252.1.1033.18.895.321 [GMT -8:00]
AV: avast! Antivirus *Enabled/Updated* {7591DB91-41F0-48A3-B128-1A293FD8233D}
AV: Malware Protection Center *Enabled/Updated* {3E21A5B8-106D-4EC4-AA7A-49D39654F5E3}
FW: Malware Protection Center *Enabled*
============== Running Processes ===============
C:\WINDOWS\system32\svchost -k DcomLaunch
C:\WINDOWS\System32\svchost.exe -k netsvcs
C:\Program Files\Alwil Software\Avast5\AvastSvc.exe
C:\Program Files\CyberLink\PowerDVD8\PDVD8Serv.exe
C:\Program Files\iTunes&#... Read more

A:Tried removing Malware Protection Center but failed?

Hello pama817 and welcome to BC.

Sorry about the delay, do you still need help?

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All, Very strange thing going on, and I've not seen it on these forums, so here I go. Turn on laptop, the HP screen appears, and about 20 minutes later, Windows starts loading.Turn off laptop, pull the battery, turn on the laptop, and Windows starts loading within 10 seconds (normal). When the battery is in, EVERYTHING takes 15-20 minutes to start.  If I select F2 for settings, it takes that long.  If I hit F10 (or possibly F8), same delay.      If I take the battery out, it works perfectly. So....I of course assume bad battery......but I've never seen this type of behavoir in ANY computer previously. Any suggestions?HP G62-340US Notebook Windows 7 Home PremiumNo error message and no changes made to system. Thanks Donlen

A:HP G62 Battery causes slow boot - take battery out and boots...

BTW - I've noticed other things like "Failed DST" and things like that...but only when the battery is installed. When battery is out....passes all diags.

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Does removing the battery and using the laptop on AC power, having the charger plugged in for many than 2 days, damage laptop hardware in any way?


View Solution.

A:Does removing the battery and using the laptop on AC power c...

No it will not do any harm. Actually it is better for the battery to remove it if you are constantly plugged in. 

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Is it possible to remove the battery from my U410 to save weight? Will the laptop run?Will I lose surge protection built-in to the battery pack?

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I want to Remove the battery from a Toshiba Satellite P50-A but the connector won't come out. I've tried pulling directly from the side and pressing down on the top and pulling out. How do I remove this?

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I found an old PC (Progen) in trash that didn't come with hard drive and CD-Rom, but when first try to startup it can go to BIOS. (it has about 32 MB RAM)
Because BIOS has password protected, I try to reset the password by removing CMOS battery and wait for about 24 hours then install back the battery.
The problem now the PC can't go through BIOS, the fan is spinning and green light is on but no beep sound.
Don't know if the battery problem or the mobo already dead
Thanks for any help

A:PC won't go to BIOS, after removing CMOS battery

CMOS only retains BIOS settings for a few seconds after the battery is removed. 24 hours is just insane overkill.

Also, on most semi-modern machines, the password isn't stored in volatile memory and as such will never be "reset" using that method - There will be a jumper on the motherboard to specifically erase the password. You should search for that motherboard on the internet and fine the manual for it.

As for the machine not POST'ing anymore, I would suggest that you moved a jumper or that something is not seated right. Double-check that the ram, cpu, video card, any other peripherals, cables, and battery are all seated properly. If in doubt, remove them and re-seat them. Find the manual for that motherboard online and go through it, checking all the jumpers on the motherboard to make sure they are in the correct positions.

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I have an E420 Thinkpad; NO problems ever with the laptop...a great machine.  I ran some updates and the Lenovo update wanted to update the battery firmware; there have never been any problems with my battery (I have an extended battery), but wanted to update as recommended. - When I ran the update, I got a "the tool was unable to update the battery firmware due to an internal error"...and then it automatically rebooted. - Once it rebooted, I now get a DOS warning (on initial boot) "this system does not support batteries that are not genuine Lenovo....." and I have to hit escape to continue.- When it boots up, I get a battery icon that shows either "plugged in and charging" with a RED X imbedded in the icon.- The laptop does not recognize the battery.  Even though it was in good condition and had a 95% charge when I first ran the firmware update....the laptop will not operate without hte power plug attached.- When I go to the power manager and the battery tab, I get a "battery was completely discharged and needs to be recharged verbiage- I have tried to re-run the firmware update from the update tool, but to no success. - I have tried to run the firmware update by downloading the install .exe file and running from my desktop....to no success.- I have tried to do a system restore, but it did not work.- I have screen shots of the screens mentioned as needed. Help!  I now have a small desktop that has a closeable lid.  It will not run if t... Read more

A:Battery Firmware update - failed and now will not ...

I have the same issue.Waiting for the software update or workaround

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I located an older mobo, an Explorer III motherboard (screen says on boot up: Award Modular Bios v4.51pg followed by P51430VX/280DM Xplorer III Bios v1.3s 9/7/97). The board appears to function fine but CMOS isn't holding the setup config. It loads the Defaults (cpu to 75MHz when it should report the value I set it at = 166MHz) The cpu is a Pentium-S @166Mhz. Since the battery holder was broken, I replaced it & added new 3V battery. The battery measures ~3.5 V but the "Error on checksum" still appears & I still get reports for "CMOS Battery Failed". So, re-heated and also removed & re-soldered the holder conn's (about 20x's) but still get the same result each time. How do I buzz out the connector? I have No diagrams of board. I would check the board with a meter if I knew where the check points were located. This board (as said in your file) performs an "auto detect" via SpeedEasy and is worth keeping since it has a low level format capability.

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My first post. Charge on battery went to 0.  Icon indicates "not charging" even when adapter is plugged in.   PC runs on power adapter.Ran HP EUFI diagnostic on battery.  Failed.  Said battery not installed (it is!) PC slow to boot up, even when plugged in. System check indicates BIOS is uptodate. Is it a hardware or software issue?  Thank you for your help.  

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I recently downgraded from windows 10 to windows 7. After the update, whenever i remove the battery, my computer freezes periodically. Whenever i put the battery back in, it works absolutely fine. no freezes. i have disabled the battery charging, as i dont want to ruin the battery. I have a dell N5110. The battery is aftermarket model. Please help resolve this matter.

Core i5
Nvidia 525M


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I am working on a relatives computer and am having major difficulties. When I received the computer it would not boot. It would hang up when running the bios and stop with the error message no mouse, no keyboard or keyboard error. I was able to get the mouse recognised but not the keyboard. The cmois battery was removed and replaced and now there is no video. I am not sure what this computer is running. Theres a digital readout on the front that says 200 when you start up. It has a diamond video card. When I power it on the cpu fan works power supply works, theres no lights on the floppy or on the cdrom that light up. Any suggestion on what to do to get video back and resolve the original keyboard error message. I did try to boot from a floppy before the batteries removal and that did not work.

A:Monitor not working after removing cmos battery

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Volume buttons not working.  Part of suggested remedies say to remove battery, but I can't find battery case.  Solid back on rear of laptop.  Am I missing something?  How do I get to battery without taking off entire back?

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Hello I am using ThinkPad X220 with 9-cell battery (FRU P/N 42T4940)Yesterday, I update my system with Lenovo system Update, and the battery firmware update is the only important updates that I (try) to install. Long story short, when the program said that the sytem will automatically shuts down after the firmware update is complete, I clicked next to start the upgrade. Suddenly my system shut down right after the firmware upgrade started and when I turn it on again, it said that the firmware upgrade was failed and I need to turn my computer off. After I turn my computer on, the Power Manager said that my battery canot be charged because of poor condition from normal wear (my battery still can hold more than 85% of charge, more specifically 87%).I even tried to update it again using Windows 7 but no luck. From that on, I cannot charge my battery despite any ways that I tried (reset power gauge, take off the battery while the system turned on and charge it when it turned off, etc) Is there any solution for my problems?Anyway I am using the latest version of BIOS available (1.42 - EC 1.24)I am using UEFI booting with GRUB as main bootloader (Windows 10 and Debian 8.0) but when using Windows 7 I am using the legacy booting with GRUB as main bootloader

A:Thinkpad X220 Battery Not Charging After Failed Fi...

It may be that the battery is just failing.  There is a lot more to battery health than how much charge the cells can take,  If yours is the original battery for the machine, it has been used for a normal life.  The service manual for your machine https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/0a60739_04.pdf
shows the procedure for checking the battery with a meter on page 34, but there are orter types of failure that won't show up.

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Hello, I have been using the following battery for less than two years :Power Manager Battery screen? As you can see, it has been used for 159 cycles. My problem is : the battery won't charge anymore. It says that "The battery cannot be charged. Replace the battery". I'm very confused because it was working perfectly fine and suddenly it decided to stop working correctly. I will not buy a new battery because I can't believe that it died after such a light usage. Does anyone know how to fix this ? Is there a way to 'force' the battery to charge ? Thanks a lot, Sylvain 

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I tried to install a battery  update on my Lenovo T520.  The update fails with an "internal error" message being reported.  The battery does not fully charge and now lasts only a few minutes once the charger is unplugged.  The battery is a Lenovo replacement less then a year old.

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A few days ago I wanted to start my laptop: nothing happened upon pushing the powerbutton. I connected the charger and tried again, got this error before Windows booted: "HP Battery Alert The system has detected the storage capacity of the battery stated below to be very low [...] Primary (internal) battery 601" I pushed enter to reboot the system and got: "The CMOS Checksum is invalid [...] CMOS reset (502)"  I pushed enter again to reboot the system (since I had no other options). The system started, but the time / date were more than a day behind. Further everything seemed fine, though the battery wasn't charging. Not a bit. After a while I got curious and pulled out the charger, after which the system died instantly. Put the charger back in, got the same errors, and can now only use my laptop when connected to a wallsocket. I didn't have any problems with the battery or the batterylife before the situation above occured. My laptop is out of warranty since the end of january, but I think this is unacceptable for a ?1400 euro machine that's 16 months old. It's not like it was used very intensely either, I use it as an internet / writing / photo-editing machine for when I'm travelling for work. Is this a known issue? I couldn't find anything that gave the same error codes on the forum, but maybe I'm not searching with the right criteria. Any help would be very much appreciated, thanks!

A:Battery failed, laptop works on charger

@CasperH Welcome to HP Support Forum. Normally the CMOS battery can "live" up to 5 years or more. Could be some internal error but why for both batteries only. This is a mystery. For main battery, please use the following instructions to check            https://support.hp.com/au-en/document/c04700771 If failed, you need to replace battery. Regards.

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Some background about what happened first. First, one day i realised my internet browsers for computer A running on windows 8.1 have been infected by some virus as my Google search on my Chrome and IE looks weird (Google logo and blue arrow missing)

After which, i tried to find out what's wrong by scanning with various software such as windows defender and spybot s&d but nothing was found. After which i turned to using Adwcleaner after finding it online. Upon using it twice, my internet stopped working and I'm seeing this messsage on my Internet Explorer (Google is the homepage)
"DNS Lookup for "www.google.com" failed. The system reports that no network connection is available. System.Net.Sockets.SocketException No such host is known"

This is the first problem. For the second problem, after computer A is down, I imported my Chrome profiles from computer A to computer B (A macbook runnning windows 7 in bootcamp) and now my internet browsers in computer B are infected with the same unknown virus of having a weird looking Google search and not being able to access both yahoo and bing search.

I've tried some of the method in http://forums.techguy.org/virus-other-malware-removal/ but still cannot get my internet back working on computer A and find the unknown virus in computer B.

Can you help me solve the internet problem in computer A first? I'll post the reports I've generated using the various software mentioned in the o... Read more

A:DNS Lookup Failed (Cannot access internet) Upon Removing of unknown malware

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My laptop gets really hot and slow after 1-2 hours when battery is plugged in and charging, since i usually keep it plugged.

I have heard that removing the battery from behind and running laptop on just the power cable will reduce the heating. Is that true?

A:Removing battery solves laptop heating problem?

The heating is not just your battery it's the components in the computer itself so even though it is being charged from the power cable some parts will get hot considering the frame of the laptop is so close to stuff inside.

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Hi all,
So I've bought an OptiPlex 7010 SFF and wanted to install Win10 on it, so I've changed the BIOS settings to make a UEFI boot, Secure Boot etc. and I was stuck on a black screen.
Browsed the internet for a solution - update BIOS.
Okay then, downloaded the utility, temporarily installed Windows 7 on it, BIOS updated successfully from A12 to A25.
Changed the settings back to make the UEFI installation happen...
Powers up normally, HDD starts, and black screen. Actually - I can press the escape or spacebar to cause the progress bar to appear altogether with "F12 - Boot Options" but nothing else. After that, a complete darkness appears.
Tried to enter BIOS - No luck. Smashing F2 and F12 causes only to show "Preparing to enter BIOS setup" or single-use (?) boot menu. After that again - black screen.
Removed the CMOS battery, messed with PSWD (Password Jumper), removed everything and installed back, nothing.
Tried to start it without RAM - beeps so it's supposed to be alive.
Hope that's not a mobo issue...

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HiI am trying to install (http://mobilesupport.lenovo.com/us/en/downloads/DS035310)but I get this message:                  there are no attached batteries that require a frimware update. current battery code is : 0003-800A-0010-80A3 plz help me.thanks


any fix?

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Hi guys,
I'm hoping some of you will be able to tell me what is going on with my laptop. Here's what happened- about a month ago (while I was in London for a weekend), I wiped Vista from my Toshiba Satellite M100 (it's about 2.5 years old) and replaced it with Windows7. Everything was great for a couple of days...then I came back to Amsterdam and plugged it in to charge, and realised it wasn't charging at all. I removed the battery completely and tried to turn my laptop on, and it seemed to be a problem with the power cord- it was totally dead. So, I ran to the nearest computer store, bought a new generic power cord, and my laptop was back on track! Or so I thought...

With the new power cord, the battery seemed to register that it was charging, but only briefly each time I plugged it in. As soon as the battery drained (which didn't take long as each attempt to charge it didn't go very far), the laptop would switch off. So, I removed the battery. I have been using my laptop sans battery for a month now, which isn't a huge problem. However, over the last week, my laptop has just completely blacked out a handful of times. The first time it happened, I thought it was because I'd somehow pulled the generic power cord out without noticing. When it happened again, I realised that my laptop really isn't happy, but I have no idea why.

Each time I have started my laptop after a blackout, it seems to be ok. One time, however, it went into... Read more

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