Ok basicaly the problem when I boot up my computer I get a nasty grinding sound. I was told that when this happened it was the 2 plates/disks in the hard drive rubbing and I should shut my computer down and try again. This works and they often stop the grnding for a while, but also this person said it was a sign of my hard drive dying if that were ever to happen to me. Is this the case, and if so how can I tell which one is going?