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CMOS checksum error

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  • CMOS checksum error

    Can a CMOS checksum error occur by itself? Yesterday, when I shut down the PC, all was working fine. I hadn't been tampering with anything at that time. Today, however, when I turned on my comp, it was acting strangely.. "it said CMOS checksum error" in the POST screen, and that it would revert to defaults, but it never did. It wouldn't boot, and I could barely enter the BIOS. And the bios version seemed to have changed from F8 to F4. Maybe the backup BIOS took over? I'm not sure.. There were some items missing in the BIOS as well. Anyway, I cleared the CMOS, and now everything is working fine. But still, it feels like things like this shouldn't happen all by themselves... Could it be some BIOS virus or something?

  • #2
    Re: CMOS checksum error

    Dead CMOS battery possibly?
    GIgabyte GA-990FXA-UD3
    AMD FX8120 @ 4GHz
    Patriot 1866MHz EL series 2X4GB DDR3
    Powercolour HD 6970 2GB w/XFX 8800GT 512MB Hybrid PhysX
    Creative X-FI titanium HD w/Technics class A 300W amp and tower speakers
    PC P&C 500W PSU
    2TB Seagate
    Coolermaster 690II w/Corsair H100 tucked under the hood

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    • #3
      Re: CMOS checksum error

      I don't think it's the battery.. I bought this pc a few months ago.

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      • #4
        Re: CMOS checksum error

        I would test it with a Multi Meter anyways. Sure sounds like that kind of issue. THe only other thing I can think of is maybe the bios could need updating? Or there could be a failing part like the memory, CPU or motherboard. Checksum error almost always occurs when there is a major hardware change and the bios settings are in conflict. Is it a homebuilt or a name brand PC? Give some system details.
        GIgabyte GA-990FXA-UD3
        AMD FX8120 @ 4GHz
        Patriot 1866MHz EL series 2X4GB DDR3
        Powercolour HD 6970 2GB w/XFX 8800GT 512MB Hybrid PhysX
        Creative X-FI titanium HD w/Technics class A 300W amp and tower speakers
        PC P&C 500W PSU
        2TB Seagate
        Coolermaster 690II w/Corsair H100 tucked under the hood

        Comment


        • #5
          Re: CMOS checksum error

          I built the rig myself, and it has ben working flawlessly ever since I did (that is, until a few days ago;-)
          My specs:

          Mobo: Gigabyte GA-K8NXP-9 nf4 U
          CPU: Athlon 64 3000+ Venice
          Ram: OCZ Gold 2x512 mb PC 3700 EL
          Graphics: Gigabyte GV-RX80L256V X800XL 256 MB 256 bit Silent Pipe
          HDD: WD 160 GB SATA II

          As for the BIOS, it's up to-date.

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