My MBP recently fell from a couch to a carpeted floor where it landed on the corner that the hard drive is one (it was shut). I now have a slight vibration however, that is the least of my concerns. When I was using iTunes the next day my hard drive seemed to stop working. I put it to my ear and the chattering was very rhythmic. My computer then stopped responding with anything that required the hard drive, such as opening applications. This makes me believe that it is a hardware problem, however I was on my windows partition playing skyrim all day with no problems. Should I reinstall the OSX?