Unplug the computer, open the case, remove the cmos battery (looks like a silver coin), wait about 30 seconds and then replace the battery. You don't have to wait very long for the cmos memory to clear.
Open your computer, put out BIOS battery out, put jumper for clearing CMOS in Clear cmos position, put it back after 5 seconds, wait 30 minutes, password should be gone. If not, leave motherboard without battery for couple of hours, or best, over the night.
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