Have you tried putting in a different cmos battery? Like taking the cmos battery out of your computer and trying it in hers? Try that and if it still doesn't work, try your psu with her computer as well... if it still doesn't work then, it's time for a new mobo...
Im tryin to fix my girlfriends comp and havent run across anything like this before.
specs are as follows
os - win98
processor - p3 1gz
memory - 128 mb pc 133
hard drive - manufacturer unknown 40gb
she says she was updating turbo tax and went to reup her drink when the dl was 90% complete, came back and screen was black.
when I try to start the pc the led on the monitor turns green, then goes back to orange, but doesnt show signal test message, No beeps during startup, cant get into bios, key board doesnt seem to work, the numlock led lights up for a second when you first hit the power button.
basically when you hit the power button, the power and HD led's both light up and the led on the cd rom blinks for a second, then it stays like that, and wont go into bios, even with boot floppy. i tried disconnecting and reconnecting all the drives and cables, tried removing, and reseating the memory, video and audio are integrated, also when I hook the harddrive up to my comp as a slave it appears to work fine, all files intact.
anywho any help anyone has to offer will be greatly appreciated.