CMOS checksum error or CMOS battery loss


  1. DawnS
    Posts : 24
    Windows 10
       New #1

    CMOS checksum error or CMOS battery loss


    Hi,
    Just installed an update using the Windows Update and on restart of the computer after a number of failed restarts in which the computer kept powering up and down, it finally restarted but this was the screen I got - Please see attached
    picture. 02968147-0-C7-F-44-C8-94-A5-5830-A9129077 — ImgBB

    I went into the BIOS Setup but didn't do anything and exited and the computer restarted again but again had issues powering up. Finally got it restarted again.

    The computer is an Acer TC-895 and have only had it a few months and have run into this problem.

    I would be grateful if anyone could help?

    Many Thanks
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  3. fireberd
    Posts : 2,585
    Win 11
       New #2

    First step, I would do a CMOS reset. Power off PC, Disconnect the AC power cord, Press the power button for 10 seconds to drain any residual power. Open the case and locate the CR2032 coin cell battery on the motherboard. Remove it for 5 minutes. If you have a new battery I would install that instead of the old one (they usually last 5 years but with the problem, replace the battery). After about 5 minutes install the battery. Connect AC power cord, power on and see it this clears it.
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  4. DawnS
    Posts : 24
    Windows 10
    Thread Starter
       New #3

    Hi,

    If the computer is only a few months old would this be the issue?
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  6. Steve C
    Posts : 7,905
    Windows 11 Pro 64 bit
       New #4

    Check the CMOS battery voltage. My PC fails to boot if it drops below 2.8V. A new battery should be c. 3.2V.
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  7. DawnS
    Posts : 24
    Windows 10
    Thread Starter
       New #5

    The PC is booting normally now, its just that screen give me a bit of a scare and I want to make sure that the computer is fine. I have no way of check the battery voltage, however I do have a new battery to put in. It's just because of that screen I got I am worried there is something else wrong. Is there anyway to check or could this have resolved itself?
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  8. fireberd
    Posts : 2,585
    Win 11
       New #6

    Watch it, if it acts up again, replace the battery, the battery voltage may be marginal.
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  9. Helmut
    Posts : 2,734
    Windows 10
       New #7

    Just put in a new battery, decent quality branded one. Making sure contacts are clean whilst you are about it.

    Even from new these CR2032 battery holders can have intermittent connections, about 50% of that type of battery holders in my various devices.

    Industrial production grime during assembly and/or poor quality contact materials.
    The old battery could simply have intermittent problems, pointless in carry on with that. These batteries are cheap.
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  10. Berton
    Posts : 14,022
    Win10 Pro and Home, Win11 Pro and Home, Win7, Linux Mint
       New #8

    DawnS said:
    Hi,

    If the computer is only a few months old would this be the issue?
    I couldn't resist, is that the actual age or simply how long you've had it? There's really no way for a buyer to know how long the computer or its components have set on a shelf somewhere waiting.

    As others have alluded to, start with replacing the least-costly parts. Also, save a step, pull the power cord out then press the power button, wait a few minutes for residual power to dissipate then remove the battery, will reset the CMOS to the default BIOS.
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