I was using it yesterday when I started to hear this clicking sound coming from the top right hand of the keyboard I think (though I could be wrong). The sound sounds like a clock ticking or more acurately like the sound your ipod nano makes when you are scrolling. It was a constant ticking sound with paced intervals every 10 -30 seconds or so. This happened for about 3 hours and when I used it in the morning the noise went but later returned. Help? edit: It's the hard drive for sure.