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Author Topic: CMOS Checksum bad .... CMOS Battery low  (Read 6211 times)

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edzanz

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    CMOS Checksum bad .... CMOS Battery low
    « on: July 15, 2008, 09:10:05 AM »
    After a "move" PC started and mouse did work but keyboard did not. Next day on start-up did not complete and request to press either F1 or F2 to continue (in different modes), but, the keyboard does not work and have confirmed wireless keyboard operates fine. Does this mean a main battery replacement or?
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    patio

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    Re: CMOS Checksum bad .... CMOS Battery low
    « Reply #1 on: July 15, 2008, 06:17:29 PM »
    It's possible after the move the battery is not entirely seated.
    I'd replace it anyways....part # CR 2032 available at any PC shop.




    Make sure all power is removed and take anti static precautions whenever working inside the case.
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    edzanz

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      Re: CMOS Checksum bad .... CMOS Battery low
      « Reply #2 on: July 17, 2008, 08:25:33 AM »
      Thanks for your reply, did replace battery, now only one message appears: CMOS checkum bad....asks Press F1 to run setup ....Press F2 to load default values and continue... Problem still is that the keyboard does not work so unable to do any function as asked. Have confirmed keyboard OK, have tried another keyboard known also to be good (I use on another PC) but result same each time. Can anyone advise how to proceed? Thanks to all.
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      patio

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      Re: CMOS Checksum bad .... CMOS Battery low
      « Reply #3 on: July 17, 2008, 03:44:33 PM »
      Try the same with a PS2 keyboard...
      This should allow you to get into setup.
      It's the old style round plug.

      I would then DLoad and run MemTest on that machine....you may have a bad stik of RAM.

      Let it run a few hours...any error messages and it should be replaced.
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      " Anyone who goes to a psychiatrist should have his head examined. "

      edzanz

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        Re: CMOS Checksum bad .... CMOS Battery low
        « Reply #4 on: July 20, 2008, 08:33:16 AM »
        Quote from: patio on July 17, 2008, 03:44:33 PM
        Try the same with a PS2 keyboard...
        This should allow you to get into setup.
        It's the old style round plug.

        I would then DLoad and run MemTest on that machine....you may have a bad stik of RAM.

        Let it run a few hours...any error messages and it should be replaced.
                 The key board is wireless and the plug-in item has a USB plug so I have to use an adaptor for the PC, no other way. Any follow up suggestions? Am I having fun..........NO.
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        drmsucks



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          Re: CMOS Checksum bad .... CMOS Battery low
          « Reply #5 on: July 20, 2008, 02:02:51 PM »
          Get a cheap (or borrow) PS/2 keyboard.

          Enter BIOS Setup, enable BIOS defaults or set BIOS the way you want (if you don't know, use Defaults) and make sure that "Enable Legacy Support for USB,' or similar, is selected; "Save Changes" and exit. USB keyboard ought to work.
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          Re: CMOS Checksum bad .... CMOS Battery low
          « Reply #6 on: July 20, 2008, 02:03:22 PM »
          Quote from: edzanz on July 20, 2008, 08:33:16 AM
          The key board is wireless and the plug-in item has a USB plug so I have to use an adaptor for the PC, no other way. Any follow up suggestions? Am I having fun..........NO.

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          drmsucks



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            Re: CMOS Checksum bad .... CMOS Battery low
            « Reply #7 on: July 20, 2008, 02:28:52 PM »
            Try the adapter but be aware that they don't always work. I'd advise the use of a true PS/2 keyboard.

            Good luck!
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