Mark said:
If your system's clock is slipping, check the battery on the
mainboard for proper voltage.
Before anyone whose clock is running slow rushes out to buy a new battery,
he should first take note of whether he is losing time while the computer is
running or while it's powered off. If it's while powered off, the problem
*is* very likely the battery. But if it's while running, it can *not* be the
battery, because the battery isn't used while the computer is running.