Posted 24 June 2005 - 03:32 PM
Probably the CMOS battery has died; everything else working normally is the key. At this point you can set the clock and leave the computer running, or live with it, or replace the battery.
Replacing the battery is *most likely* a simple matter (and cheap) provided you're comfortable disconnecting your computer, opening the case, and poking around gently inside to locate it. Also, knowing your computer's make or motherboard type, having the booklet that came with the motherboard or the like will be of assistance. If it's a name brand start by poking around on line with your model number and search for help using the keyword "CMOS" and "battery". But even without it can be done as I'll describe next.
In most cases, the CMOS battery is readily identfiable as either a small coin-shaped metalic-looking device embedded in the motherboard or a more traditional shaped battery, usually covered with a plastic sheath, which clips on to the motherboard with a bit of wire. When found, the volt/amp rating will give the battery away. You should be able to find a replacement at bigger computer/electronics stores, Radio Shacks, etc. Just be sure you're getting the right form factor, clip size and battery specs.