This is driving me crazy, I can constantly hear my hard drive making noise. It sounds like it is processing data, it makes click noises like a bad PC does when it has too much work to do. It isn't amazingly loud, but I can hear it when I'm in my room doing work and everything is silent. Does anybody know what would cause this sound? I mean, it makes the processing data noise even when my computer is idle. It only started doing this a few weeks ago. I bought my MBP in the middle of august, it was perfect until this noise came along. And yes, I am running Leopard.