First procedure is using the chassis intrusion switch
Second procedure: Reset forgotten BIOS password - #7 by abittner
Disconnect the main battery, plug in AC power, and watch the LEDs on left and right side. The LEDs should flash blue, red. If you’ve been successful, the BIOS password should be reset.
Be very careful disconnecting and reconnecting the main battery. The pins can easily be bent. Pull straight out, and insert straight in only.