CMOS Check sum error

  wobblymike 20:31 14 Oct 2004

Hullo again

can you help - I have just finished building a PC from nearly scratch i.e the tower had a motherboard fitted and thats all. On completion all works well except that on boot up after being switched off overnight, the time and date are reset to 1 Jan 1997 and a CMOS Checksum error is highlighted - I reset the time and date and all is well until the next time it is switched off when I have to go through it again I have changed the CMOS battery for a new one without effect. Any ideas?


  ICF 20:43 14 Oct 2004

Are you saving your changes to the cmos? Have you tried clearing the cmos with the jumpers on the motherboard?

  ICF 20:45 14 Oct 2004

Have you put the new battery (and it was new wasn't it) in the right way round?

  wobblymike 20:59 14 Oct 2004


Yes it is a new battery and it is in the right way round.

How do I save changes to the CMOS?

  PA28 21:12 14 Oct 2004

Some motherboards have a jumper that requires setting to save CMOS settings (yes, I know most work the other way round!). I had an MSI with this - two pins had to be jumpered to ensure that settings were retained. Check your manual in case this applies here.

  ICF 21:21 14 Oct 2004

You have not told us what motherboard you have?Or any other details (spec) of your system.


  wobblymike 21:27 14 Oct 2004

I'm afraid I dont know - its a Pentium 2 400 Mhz processor and that about all I know. I will run Belarc Advisor and see if that helps.

  PA28 20:36 16 Oct 2004

If it doesn't, whip off the side of the case again - you'll find the motherboard details are printed on it in most cases. Also have a look for the chipset - this is normally also printed on the chip itself.

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