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Author Topic: CMOS checksum error  (Read 5702 times)

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Raptor

  • Guest
CMOS checksum error
« on: July 29, 2005, 04:22:15 PM »
Even though the CMOS battery has been replaced, the computer, with a GA-7N400Pro mainboard, keeps showing a CMOS checksum error the moment I disconnect it from the power grid.

It has done this ever since I first bought it and it has continued to function perfecty well over the years.

What does this indicate?

The CMOS is


  • able to hold all information when left on stand-by voltage.
  • Updated to the latest variant
  • Approximately 2 years old


Gigabyte will simply keep sending me new CR2032 batteries as they do not seem to fully understand my problem.


« Last Edit: July 29, 2005, 04:23:51 PM by Raptor »
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2k dummy

  • Guest
Re: CMOS checksum error
« Reply #1 on: July 30, 2005, 07:01:42 AM »
I have an older Gigabyte MB that would (occassionally) do that. Reloading the chipset drivers from the Gigabyte CD (seems) to have stopped the problem. If you choose to try this, DO NOT load more than one set of drivers without rebooting. I had to reload the mini port drivers and the PCI bus master drivers.
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Raptor

  • Guest
Re: CMOS checksum error
« Reply #2 on: July 30, 2005, 07:23:02 AM »
The system has been recently reformatted and if I recall correctly, I reset after installing each driver, which are of the latest version available, to make certain nothing would go wrong.
« Last Edit: July 30, 2005, 07:23:46 AM by Raptor »
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2k dummy

  • Guest
Re: CMOS checksum error
« Reply #3 on: July 30, 2005, 09:20:05 AM »
Have you tried starting with the backup bios to see if the problem occurs there. It is a dual bios board, isn't it? If the problem does not occur with the backup bios, you can recover the main bios from the backup.
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Raptor

  • Guest
Re: CMOS checksum error
« Reply #4 on: July 30, 2005, 09:36:01 AM »
Quote
Have you tried starting with the backup bios to see if the problem occurs there. It is a dual bios board, isn't it? If the problem does not occur with the backup bios, you can recover the main bios from the backup.


It is indeed Dual BIOS - I will load the backup BIOS to see if it happens.

What does Wide Range Protection mean?
« Last Edit: July 30, 2005, 09:38:51 AM by Raptor »
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Raptor

  • Guest
Re: CMOS checksum error
« Reply #5 on: July 30, 2005, 09:42:45 AM »
Something I only now noticed:

1. When taking the computer off the power grid, even the backup BIOS fails to retrieve the settings I configured it to.

2. Unless the BIOS is configured, the CMOS checksum error will keep resetting the dual BIOS utility (v1.33)

3. The backup bios seems to work with the exact same settings as the main BIOS.

This is all rather perplexing.

Is the backup BIOS an actual BIOS chip that can contain its own settings?
« Last Edit: July 30, 2005, 09:50:39 AM by Raptor »
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2k dummy

  • Guest
Re: CMOS checksum error
« Reply #6 on: July 30, 2005, 02:56:18 PM »
There are 2 bios rom chips on the MB. You will need to check your manual for the correct settings concerning auto recovery. If wide range recovery is enabled, auto recovery is enabled by default and you can't change it. It will also automatically switch from one bios to the other if a fault is detected, even when the system is up and running. Your manual should show all of the settings.
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Raptor

  • Guest
Re: CMOS checksum error
« Reply #7 on: July 30, 2005, 04:32:21 PM »
I have familiarized myself with the dual BIOS - although I am still clueless as to why the CMOS checksum error appears the moment the computer loses power.

I will look into replacing the battery. Perhaps I drained it too soon by disconnecting it too often?
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Fed

  • Moderator


    • Sage
    • Thanked: 35
    • Experience: Experienced
    • OS: Windows XP
    Re: CMOS checksum error
    « Reply #8 on: July 30, 2005, 05:05:24 PM »
    You should check that the battery has a good connection too.
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    Raptor

    • Guest
    Re: CMOS checksum error
    « Reply #9 on: July 31, 2005, 08:28:13 AM »
    Quote
    You should check that the battery has a good connection too.


    How do I do that? It is very stuck, I am a little hesistant to remove it as I have forgotten how.
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    Fed

    • Moderator


      • Sage
      • Thanked: 35
      • Experience: Experienced
      • OS: Windows XP
      Re: CMOS checksum error
      « Reply #10 on: July 31, 2005, 03:07:26 PM »
      It's hard to say without seeing it.
      Take a macro picture.
      You could use a voltmeter and see if there is any power at the outgoing contacts.
      Be very carefull removing it, my son broke mine on a previous computer.
      He bent the little arm that presses down on the top of the battery and when he pushed it back down it broke off.
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      Raptor

      • Guest
      Re: CMOS checksum error
      « Reply #11 on: July 31, 2005, 04:03:45 PM »
      I might look into it, but I am hesitant to remove it. A photo can't hurt. Will make one when I install the new PSU I ordered.
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      merlin_2

      • Guest
      Re: CMOS checksum error
      « Reply #12 on: July 31, 2005, 06:54:02 PM »
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      Raptor

      • Guest
      Re: CMOS checksum error
      « Reply #13 on: July 31, 2005, 06:57:28 PM »
      Quote
      http://www.computerhope.com/issues/ch000237.htm


      I have read this article when I was first working in the BIOS and I have read it before posting this article.
       
      1. Bad or old CMOS battery.
      2. BIOS update.
      3. Disconnecting power from computer without shutting down computer

      1. Two different batteries, both issued by Gigabyte would then be bad

      2. Latest update on both backup and main BIOS. No errors or mistakes occured during flashing.

      3. Irrelevant.
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      merlin_2

      • Guest
      Re: CMOS checksum error
      « Reply #14 on: July 31, 2005, 07:36:00 PM »
      Motherboard/daughterboard.........had it........
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