Most PCs will not boot properly if the CMOS battery quits. You'll get a message saying the battery's dead, your clock needs to be reset, or your hard drives are not configured properly. All changes you'd made to your BIOS will also be lost and will revert to default values...not necessarily the ones that make your PC run at its best.a123 said:what happens when the battery on the mobo dies? lol... just curious... it has never happened to me before