This is what's happening to my iMac. http://www.youtube.com/watch?v=1f4TEn8zfas I have no clue why. This occured AFTER installing the new updates Apple had including the Safari and iTunes updates. I don't understand why... I've booted into Windows 7 via BootCamp no problem, and when I go on Mac OS X, it just doesn't work. Any suggestions/help? Thanks guys P.S. I've already made an appointment with the genius bar just in case.