CMOS is short for Complementary metal–oxide–semiconductor. It is a chip on all motherboards that is powered by a small round battery. It contains information such as the date and time needed by the computer after the power is switched off. Quite often BIOS updates or hardware upgrades can cause system problems, requiring you to reset CMOS. This will revert all information stored back to the factory default settings. Before making these changes, you should try to rectify the problem within windows, or within the BIOS/CMOS utility first. To enter the BIOS utility, reboot the computer and at the first screen you see, press the 'del' key. (Some propriety computers, such as Dell have different keys that need to be pressed. See if there are instructions displayed at the start up screen, or consult your motherboard manual.) Make the relevant changes, or you can select 'restore factory settings'. If none of this works, try the following instructions.
There are two ways to do this.
1) Clear CMOS pins:
2) Remove Battery:
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