This is pissing me off now. I got my Pro on Friday with the 7200rpm 500GB HDD, and it was extremely quiet with just the whir of fans that could be heard. I've turned it on today at lunch time and all was fine, and now I've got it home, taken it out of sleep and there is what appears to be almost a clicking noise, which I can only imagine is the HDD? Why is it doing this? It doesn't sound normal. I picked the MacBook up and moved it in different directions slightly and the pitch changed depending on where I place it. Is this a fault?