I was sat typing away in my iBook that just turned 1years old. And suddenly i hear this buzz. I look to my left, and then to my right. And then I realise, it's coming from my iBook. It's from the left hand side at the front, not hot at all but still a clear 'bzzz'. I am running the hardware test on it now. But is this a serious problem or a sort of one off thing I shouldn't worry about? Cheers, Jon EDIT: I should have mentioned. It is not constant. Just heard it 5 times max each time for a couple of seconds. And I hope its not hard drive failure, I really don't have time for this.