How to Restore CMOS to Factory Settings Before you begin: Remove the access panel, 2.5in storage drive, and storage drive cage. Steps Carefully release the CMOS battery from the socket retention clips that secure it on the motherboard and remove. Wait thirty seconds. Carefully secure the CMOS battery under the socket retention clips on the motherboard. CMOS factory settings are now reset. IMPORTANT: You will now need to enter system BIOS and reset the clock in BIOS after this procedure.