Question about IBM ThinkPad A21m 2628 Notebook

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System Each time I unplug and replug my laptop in and start it up, the system seems to be "forgetting" the correct set-up for the date/time. I have to manually reenter it before the laptop will continue to start up.

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  • cidergirl Feb 07, 2008

    Actually, this happened after I replaced the c-mos battery.

  • cidergirl Feb 07, 2008

    The current battery is brand new.

  • cidergirl Mar 12, 2008

    Are you referring to the little yellow round battery? If so, it is brand new. I put it in about a month ago. Since that time I have to reenter the date and time before continuing with boot-up.

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The internal battery needs replacing. Must be the original and they die after a time.

Posted on Mar 12, 2008

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Change the c-mos battery which is present inside the laotop

Posted on Feb 07, 2008

  • rohan Feb 07, 2008

    you are using a new c- mos battery or older one ,

    else change for a good newer one c-mos battery.

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Patriot d600 lap top telling me bios is wrong on boot up.


You can answer Ihm that it is not to trust throug set the correct Date and Time on the Bios!

Aug 02, 2013 | Acer Aspire 3680 Laptop

Tip

How to replace the CMOS battery in an Acer Aspire laptop.


General info
All laptops have a CMOS battery. The main purpose for the CMOS battery is to store the system time, date and BIOS settings even if the computer is turned off or the main battery dies. Individual Acer Aspire laptop models differ somewhat, but the general steps are the same when replacing a dead CMOS battery.

Before you start
1) Read through the owner's manual for your particular Acer Aspire laptop to determine what kind of CMOS battery you need.
2) Purchase the battery through Acer or a local or online computer parts dealer.
3) Turn the laptop off and unplug it. Also unplug any external hard drives, cameras, or other external devices.
4) Turn the laptop over (bottom facing up), then touch something metal to remove static charge.

Removal of the CMOS battery
Remove the Phillips screws that secure the motherboard cover (refer to your owner's manual if necessary), then release the cover from the clips on the bottom of the plastic casing. Lay the cover aside then locate the CMOS battery cable on the right side of the motherboard. Unplug the cable then remove the battery.

The battery should look something like this

slasher_x_2.gif
Plugging the new battery in
Plug the new CMOS battery cable into the motherboard. Slide the battery partially under the laptop casing (somewhere to hold it in place), then align the cover with the slots on the bottom of the laptop housing. Replace the screws then turn the laptop back over.

Finalizing
1) Turn the laptop on.
2)Enter your BIOS (usually by pressing the "Delete" key) before the operating system loads.
3) Follow the BIOS prompts or refer to your Acer Aspire owner's manual to reset your time, date and desired system settings.

Reason: Anytime the CMOS battery is unplugged for more than a few seconds your BIOS will be reset to the default manufacturer settings. If you make any changes to the BIOS that cause problems with your Acer Aspire, unplug the CMOS battery for 3 to 5 seconds to correct the problem.

Please rate this tip by clicking the thumbs up at the bottom right of this solution. Your rating is much appreciated.
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on Nov 12, 2010 | Computers & Internet

1 Answer

Bl51 motherboard


All laptops have a CMOS, or "Complementary Metal Oxide Semiconductor," battery.
The main purpose for the CMOS battery is to keep the system time, date and BIOS settings even if the computer is turned off or the main battery dies.
Individual Acer Aspire laptop models differ somewhat, but the general steps are the same when replacing a dead CMOS battery.Preparation

Read through the owner's manual for your particular Acer Aspire laptop to determine what kind of CMOS battery you need.
Purchase the battery through Acer or a local or online computer parts dealer.
Turn the laptop off and unplug it.
Also unplug any external hard drives, cameras or other external devices.
Turn the laptop over (bottom facing up), then touch something metal to remove static charge.
Removal
Remove the Phillips screws that secure the motherboard cover (refer to your owner's manual if necessary), then release the cover from the clips on the bottom of the plastic casing.
Lay the cover aside, then locate the CMOS battery cable on the right side of the motherboard. Unplug the cable, then remove the battery.
Installation
Plug the new CMOS battery cable into the motherboard.
Slide the battery partially under the laptop casing to hold it in place, then align the cover with the slots on the bottom of the laptop housing.
Replace the screws, then turn the laptop back over.
Settings
Plug the laptop in and turn it on.
Enter your BIOS (usually by pressing "F1," "F2," F10" or the "Delete" key) before the operating system loads.
Follow the BIOS prompts or refer to your Acer Aspire owner's manual to reset your time, date and desired system settings.
BIOS Reset
Any time the CMOS battery is unplugged for more than a few seconds, your BIOS will be reset to the default manufacturer settings.
If you make any changes to the BIOS that cause problems with your Acer Aspire, unplug the CMOS battery for 3-5 seconds to correct the problem.
http://support.acer.com/us/en/default.aspx


Acer aspire laptop battery replacement
http://www.youtube.com/watch?v=mQTZ1AUR0uw

Jul 24, 2013 | Acer Aspire 5100 Notebook

2 Answers

The system clock will not stay set, when I turn off laptop the clock stops and calendar stops . I reset it every time I turn it back on so I receive all up to date updates . Windows updates are set to ...


You need to set the correct date and time in your system BIOS. To access that you need to press the correct key when the computer is first booted (usually DEL or F10/F2/F11).
Most computers will have a message stating press xx Key to enter setup or etc.
If this problem persists even after setting the correct time in your BIOS, your laptop needs a new CMOS battery. I recommend having a professional do this.

May 09, 2011 | Acer Aspire 6920-6422 Notebook

2 Answers

I forget the bios paswword how i can remove


Hello,

There is a solution for your problem,

you have to remove *********** board battery cell from your laptop & than start your laptop once.

after that you shutdown your laptop & than you fix your battery again in your laptop's motherboard.

after that it will not ask you for any password.

Thanks

Dec 30, 2010 | Toshiba QOSMIO F15-AV201 Notebook

1 Answer

My acer aspire 5520 when i press power fan comes up then shut


From your brief description, it seems that your hardware is starting correctly, and then it tries to load Windows. Windows then fails to load fully, and so Windows forces the computer to restart.

So, turn the computer on.
Immediately press F8 (again and again) until a "start-up" menu is displayed. Select "Safe Mode" and see if Windows will start.

If it does, use the "System Restore" application within "System Tools" within "Accessories" to go "back-in-time" to a date/time when your computer *was* working correctly. Restore to that date/time.

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2 Answers

Sony vaio vgn-fs775p laptop real time clock not keeping time


Hi

thank you for your query

If the time is not keeping up then it would seem that you will need to change your CMOS battery, this is a small battery found on the motherboard responsible for clocking etc

The battery is cheap to purchase, however I do highly recommned the laptop be booked into a reputable PC shop for replacement as you will need to take the whole laptop apart to get the motherboard

I hope this has been helpful

Mar 09, 2010 | Sony VAIO VGN-FS790 Notebook

2 Answers

Will laptop work with dead cmos battery?


Yes, but each time you start the computer you have to enter the BIOS to set the proper time and date. This is essential for certain progra,s to run correctly, when the computer shuts off, everything will be reset once more.

Oct 08, 2009 | HP Pavilion dv1000 Notebook

1 Answer

My HP Dv6700 will not start up. At times, it will


Dear User,
It seems that the files of operating systems are got corrupted due to virus or due to abnormal shutdown.
So please try to start it in safe mode and if you are successful in starting in safe mode then restore your system to the previous Date.

hopefully your problem will be resolved. and if your still got problem then you have to repair your operating system with using the operating system installation disk.

Note:- please dont forget to RATE my solution

Sep 08, 2009 | Computers & Internet

1 Answer

Clock not keeping correct time


The CMOS battery keeps the laptop configuration stored in the CMOS chip and the main battery has no effect on the CMOS.
If the date and time drift off, it indicates the CMOS battery is nearly flat and needs to be replaced.
If you had ticked the Daylight saving box in the Time Zone tab in Control Panel - Date and Time setting then the time would automatically adjust for Daylight saving.

Apr 05, 2009 | IBM ThinkPad T40 2373 Notebook

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