I constantly hear a noise coming from my MBP even if it's idle, or just surfing the net! I can hear the noise from even 1 foot away! I'm not sure whether its from the fans or the HD! My CPU temperature right now is 52C and fans are at 1999rpm (using SMC fan control). My HD is a Hitachi 7200rpm 320GB. Any help will be much appreciated to make my system silent.