My ipad screen goes dim then it locks up completely... I've restarted/rebooted it twice, but each time after a few seconds the screen will go dim, not dark or black, just dim then it locks up completely... What gives here? This is the first problem I've ever had with it... I'm trying to restore it via iTunes but I get an error message saying "The iPad "iPad" could not be restored. An unknown error occurred (9).