Resetting the CMOS

The CMOS battery provides power to the motherboards so it can store start up information. Sometimes the motherboard will report an error and prevent the computer from booting, by removing the battery you flush any old errors that could be preventing the board from starting.

Resetting the CMOS

Remove the Power chord from the Power Supply.

The CMOS battery is generally located by the Graphics Cards PCI E slot. 

The battery is held in by a spring, push the spring down and remove the battery.

Hold in the power button for a few seconds to release remaining power.

Put the battery back and try switch on the computer.