I've been having problems with my MBP recently... one that recently cropped up is persistent hard drive noise which sounds like vibrations, as they come and go every few seconds. Is it my hard drive dying? And will it be covered under Applecare? Also, whenever my battery life drops below around 80%, the whole laptop just shuts off. It doesn't boot, battery indicator on the battery shows four out of five, and it will only boot if I plug the charger back in. Any ideas? I'm planning to take it to a store today to get it checked out anyway.