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.

One of the main culprits behind BIOS issues is the CMOS battery. The battery powers the CMOS memory, which stores BIOS settings. If the battery is drained, the CMOS will not remember the settings, and ...

I'm working on an old Dell CPx J PIII for a friends kid's and need to replace the CMOS battery. Any ideas on how and where it needs to be replaced? Thanks.