Look into your motherboard documentation to learn how to
reset the power on password. Some motherboard require you
to remove the CMOS battery, other is done by a bypass
switch, etc...
When you turn the computer on, press whatever keys is tells you to in order
to get to setup. Look for the security menu and from there the power on
password. Just delete the power on password, save the changes and exit
setup. The computer should continue startup without asking for a password.
