I believe I have seen previous threads on here for similar issues to mine, but I wanted to create a separate thread in case there was a unique issue with my model. I bought my Early 2011 MBP new, so I've had it a while and I understand that it's probably time I did a bit of upgrade work or bought a new system altogether. But recently, I've been getting an unusual sound that can be described as a constant, spinning rattle. The sound changes when I lift the MBP up and the sound can be manipulated by pushing on the bottom case. Is this hard drive? Does it need replacing? I'm fairly tech savvy but not enough to start opening the thing up and start playing around with it. Any ideas welcome.