Replace the CMOS Battery

The CMOS battery is a small battery that helps the BIOS store important information, including configuration, date, time, power running the BIOS firmware, and various hardware settings. The BIOS needs to maintain power at all times, even when your computer is not connected to an external power source. So, if you replace the CMOS battery, the BIOS will lose its stored settings, and it will return to its default state.

After replacing the CMOS battery, you'll need to reconfigure your BIOS settings and restart your PC.