I've noticed, and this isn't consistent, but occasionally with my new 2011 mbp 13" i5 when I put it down, if I put it down at a slight angle, front right of the macbook leaning down, (I think this is where the harddrive is?) there is a click noise? I don't know if there is a loose screw in there or something? I'm not sure what this is. It only happens when its at this angle though, front right at the lower point of gravity. Anyone else experiencing anything similar or any ideas? Can't be normal?