Hey i suffer from this as well. Although, the noise subsides sometimes, depending on the apps i run, which isn't too taxing in the first place. But i took it to the apple store for a check up, and the guy said it's a small, easily replaceable problem. He ordered the part, and i'm just waiting on them at the moment. I even recorded the sound to make sure the apple guy wouldn't scoff and say it was my imagination or something. Hope this helps, given that you're near an apple store...