Help! I've been using my first macbook for about 4-5 months now and have encountered a disturbing problem. Typically, when I close the lid after use (without shutting down) the macbook makes a clicking sound that lasts for about 30-60 seconds. Also, when I open the lid (again, without having shutdown) the same clicking sound - about 30-60 seconds. This does not happen every time, but most of the time. Also, if I tilt the computer a little bit when it is making the noise, the noise will increase a bit. I have never dropped the computer. The clicking noise ALWAYS stops and has never started up during regular use (which can last for 8 hours), only when lid is just closed or just opened. Thanks for your thoughts.