I just bought a 15" Powerbook 1.5 Ghz Superdrive 512 megs ram (2x256) and it started doing something strange... All of a sudden it will just start blasting a static noise out of the speakers. It will go through the external speakers I have plugged in, or through the computer speakers. Also, the little light on the button next to the optical drive is on sometimes, off sometimes, and then flickers sometimes. Any suggestions? Thanks do you think a USB hub would possibly cause this?