Cmos Battery Replacement. There are several reasons the CMOS battery needs to be replaced in your computer. NOTE: The values stored in the CMOS memory are now reset to the factory default values.
The main cause of a CMOS battery failure is that it has lost it's charge. On reboot HD was not detected, auto and user. This page provides information on why you would need a replacement, and the steps to fix it.
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Can the Coin Battery be replaced at home.
If this event occurs, replace the battery with an equivalent one. If I can replace the CMOS battery and not only fix the time but also the booting issue of my PC, I think it's worth a shot. CMOS battery replacement procedure How to replace laptop BIOS battery with a standard PC.