I have used this little trick to wipe out the pass word accounts, near the battery there should be three pins with a blue or brown plastic jumper connected to two of them, I just turned the system off, put the jumper on the empty pin and the center pin, start up the system,shut the system off and return the pin to the original position, that wipes the administrator account clean and you can be the original administrator, the original jumper is usually the center pin and the pin to the right of center.