About 90% of the time, I am using the MBP on the couch while watching TV. When I pick up the MBP to move it around, the HDD makes a quiet "CLICK" sound... It does it more when the base is slightly vertical if that helps. Is this by design? The first thing I thought it might be doing is preparing for a drop by stopping the read/write. Then again, it may be the ugly sound of a dying HDD. Ideas? EDIT: I should probably tell you what I have. Spring 2010 MBP. Specs are in signature.