Master reset for pc

Unplug your machine from wall outlet. Open the case and remove the flat battery from the motherboard. Wait 5-15 minutes and replace it, your machine is now at default settings.
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Shut your system down and remove power cord.

Look on the motherboard for a small 3-pin jumper. Pins 1 & 2 will be jumped. Remove the jumper and jump pins 2 & 3.

Now hold your power button down for about 15 seconds. NOTHING WILL HAPPEN and that's OK!! Now put the jumper back on pins 1 & 2, plug your system back in and fire it up. Your BIOS is now reset back to day 1.