It sounds like it's in pain... It's like nails down a chalk board except it sounds more like two bits of metal scraping past each other, maybe a bit like a chav keying your car. Either way it's not good, everything slows down/freezes during the freak out so i'm guessing its harddrive related (always a kick in the teeth). Anyone experienced similar problems? Mine is the 3.06 Alu for reference, and I couldn't find much on google (or your favourite internet search engine equivalent).