You need to begin by locating the CMOS battery, which is a thin, round, button-like object. It can sometimes be hidden by extension cards or connectors. On older PCs it may have a cylindrical shape.

CMOS stands for Complementary Metal Oxide Semiconductor. It is a small battery that provides a continuous power supply to the CMOS chip. A CMOS chip stores BIOS settings. When a CMOS battery dies, you ...

The motherboard of PCs and laptops contains a battery that runs the CMOS (complementary metal-oxide-semiconductor) and keeps the computer's clock accurate. Although it may not seem vital to the ...