Enter Bios

Desktop - Next to the battery, there is a 3 pin jumper...

1. PC is off

2. Move the block to cover the othere 2 jumpers

3. Wait 5-10 seconds, move it back...

Turn it on

Laptop.. Remove battery, remove power cord, open it up and remove onboard battery... Reconnect all and turn on. Some laptops you will need to contact the manufacturer for their password.

Good luck

If you know the password it is best to enter the bios and reset the password to a NUL (blank) entry.

I you dont have the password look for a Jumper on the board. it is usually marked PWD and has no standard location. typically you remove the jumper , start the machine up, shut it down, and replace the jumper. this only removes the password.

if all else fails remove the system battery for a short time (the worst case I've ever seen is 30 min) then replace it. However this will clear all of your bios settings.