Hello! I bough my MacBook Pro (Unibody, 15") in November of last year. Just today, it'll randomly start making a loud buzzing/whirring noise and won't stop until i force shut it down. if i turn it back on, it'll be fine until it'll randomly do it again. the computer still works as usual, but it makes this very odd and probably not good noise. Do you have any suggestions for a fix, or should i take it to Apple? Thanks!