more of a clicking noise. Story is, on a new 2.8 ghz 17inch, I can hear a distinct, very high pitched, high frequency tone. I imagine it sounds very much like the noise Boy Genius is reporting about the 3GS, his description sounds very similar. I've tried to show a few people, but its been a hit and miss as to who can hear the sound. Anyways, at first I thought it had something to do with the backlight, as whenever adjusting it, the noise is seemingly gone at the lowest setting, gets really loud around halfway, and when at the highest setting, while the noise is not as loud, its certainly still there. Went to see the genius yesterday, and when I played back an example of what I was hearing, he immediately diagnosed it as hard drive failure. Is he right? It sounds a little odd given that this is the 2nd unit I've had that has had this problem, also sounds a bit strange given that its a brand new unit. He ordered a new drive, and while I wait for that to get in, I thought I would come here to ask for advice, should I just let them change the drive or stop wasting time and just ask for another replacement? Thanks!