quick question, it does not matter if my computer is off or in sleep mode whenever i seem to pick it up and flip it over or shake it a little i hear a loose screw/rattling noise coming from the back right of the computer near the disk drive area. i took it to the apple store they took it apart and made sure everything was tight ect handed it back to me and said everything is perfectly fine and its running great but the noise did not go away it is still there. The computer has been running great no problems what so ever but im wondering if this is normal and you guys hear or experience the same thing with yours? the apple store said they couldnt find anything wrong or loose. what could it be?