Clock stopping when computer is off
i have a P4c800 MB and when my computer is off the clock does not work so the day never advances. Could this be my battery? I checked the voltage and got 3.1 as a reading. Then I checked another computer that works fine and I get 2.9 Volts on the lithium battery. I put the battery back but still have the clock problem. What should the voltage be of this battery and is this the problem? This is a new board which was installed and working fine. Could this cause windows XPpro to freeze during an installation??
The CMOS battery should be 3v, and a faulty battery can sometimes mess up the clock circuit. Even though it was a new board, the board may have been sitting on a shelf for along time. The batteries are cheap to replace and last a long time.
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I believe it is the mobo I would replace it (, but this would be a last resort). Have you tried resetting the bios as Alan suggested?
I've seen this on some laptop motherboards, but I expect that it could happen on desktop models as well.
To fix it I unplugged the power cord.
Removed the BIOS battery (the button battery on the motherboard)
Wait a while (15 minutes)
Install the battery
reconnect power cable
boot, but intercept to the bios config utility
find and run a bios reset (on some motherboards this is a jumper proceedure and not a bios screen proceedure)
Hope this helps,
Alan