Computer Hope

Microsoft => Microsoft Windows => Windows XP => Topic started by: steelercaz on September 28, 2007, 02:38:38 PM

Title: CMOS checksum error, after change of power supply
Post by: steelercaz on September 28, 2007, 02:38:38 PM
firstly, I'm really sorry if this is the wrong forum - couldn't decide if a windows or hardware prob!

I have a PC which I built 2yrs ago, after teaching myself how to do it after getting a marketing job at a computer components firm. However, I've done nothing with it since so have forgot most of what I learnt...

A week ago the pc just wouldn't turn on, at all. Took to a repair shop - it was the power supply as I thought & they replaced it. They tested it with a setup there & it worked fine, so they connected back up the rest of the components inside the case
& I collected it. However, just got it home & set it all back up, but when turned on it only gets as far as the memory cheeck screen - seemingly finding the memory, HD, DVD drive etc ok - then says 'CMOS checksum error - defaults loaded. press F1 for setup or delete to continue', but pressing either does nothing. tried a few times now.

From looking through your forums it seems it may be battery related? Are there any other things I should try first? Feel a bit out of my depth!

Can post the specs if that will help...

Thanks for any help in advance - and apologies if text speak crept in anywhere - having to access via my cellphone...
Title: Re: CMOS checksum error, after change of power supply
Post by: patio on September 28, 2007, 02:56:39 PM
It's probably the CMOS battery...part # CR 2032. They tend to die when a machine is left to sit for any long time.
Remove all power when working inside the case and take anti-static precautions...

               (http://img.photobucket.com/albums/v81/patio/cmosbatt.jpg)
Title: Re: CMOS checksum error, after change of power supply
Post by: Fed on September 28, 2007, 04:38:52 PM
If the F1 & Delete keys are doing nothing then I suspect you have a USB keyboard, if this is the case then try a PS/2 keyboard.
Title: Re: CMOS checksum error, after change of power supply
Post by: patio on September 28, 2007, 06:02:55 PM
Nice catch, Fed...
Title: Re: CMOS checksum error, after change of power supply
Post by: Fed on September 28, 2007, 06:08:15 PM
A curse on USB keyboards & mice. :P
Title: Re: CMOS checksum error, after change of power supply
Post by: patio on September 28, 2007, 06:21:38 PM
Off with their heads ! !  :o