How to CLEAR CMOS?

[Dark Mantis]

How to CLEAR CMOS?

To clear the CMOS first you need to unplug the computer from the power socket. Then check:
1) If your motherboard is equipped with Clear CMOS button then press it.
2) If your motherboard has CLR_CMOS (Clearing CMOS) jumper then place a jumper cap on the two pins to temporarily short them or use a metal object like a screwdriver to short these pins for 5 seconds. Put the jumper back in it's default position (open).
3) If above methods fail then you need to remove the CMOS battery (small silver disk) and then use method 2) and additionally wait for 10 minutes. Instead of waiting you can use a metal object like a screwdriver to touch the positive and negative terminals of the battery holder (NOT the battery!), making them short for 5 seconds. Replace the battery.

The CMOS is now cleared. Now you can plug the PC into the power socket, boot up into the BIOS, Load Optimized Defaults, save and exit.