I own a powerbook g4 and I love it. I just bought a second one(for my wife), it is used, from the teenage son of a friend. He somehow disabled the trackpad, so he could use a usb connected mouse. Does anyone know how to reactivate the trackpad? When I go to system prefs keyboard/mouse, I don't have trackpad as an option, instead I have only mouse as an option. I would really like to restore to macs default setting of using the trackpad with the option to ignore the trackpad when a mouse is connected.