CMOS problems

May 27, 2010 at 09:07:13
Specs: win xp
Looked at my sister-in-laws computer that was not booting and it has me puzzled. The problem is, I can't work in cmos, and i can't get past it because of a cmos error. The error, I'm trying to remember, stated there was a disk failure I believe. I am assuming this is the result of CMOS being reset and the HD is no longer recognized (SATA HD).
So on boot the keyboard only works once, yeah that's weird. If I hold down F2 as i power up the computer, It will open CMOS, but then the keyboard does not respond. It has to be held from power-up, I tried during the POST message but no go. I have cleared CMOS, unplugged the extra hardware in the case (CD-ROM), the keyboard is USB but there are no PS/2 slots available... I couldn't try another usb keyboard because I did not have one with me, but would that really matter if the keyboard is booting CMOS (if only working for a second)? I think it is a Dell...good old pre-made pieces of junk.
Try keyboard? Bad component? Toast MB? How this sort of stuff happens to people boggles me.
Anyways, hopefully someone has some insight or can confirm it could be dead, thanks for your help!

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May 27, 2010 at 10:56:28
It will open CMOS

No it doesn't. That's the BIOS configuration screen. CMOS (Complementary Metal–Oxide–Semiconductor) is a type of technology that is used to manufacture the memory that the BIOS stores it information in.

Because the contents of the CMOS memory is lost once power is removed, the motherboard has a small battery that keeps the CMOS memory alive when the computer is switched off.

Most problems with the CMOS memory can be solved by replacing this battery, re-entering the necessary settings in the BIOS, saving them and re-booting. Which is what you need to do.


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May 27, 2010 at 15:01:07
Thanks for the clarification.
Still wondering if anyone else has encountered this?

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May 28, 2010 at 11:58:57
Have you tried replacing the CMOS battery, as suggested above?

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