I think it has always done it, but since I've moved and now my computer is right next to my bed, it gets pretty annoying hearing that buzz. My roommate thought maybe it was all the cords laying around interfering with it, but really all I have is the power strip connected to a large, heavy-duty ext. cord and 3-4 devices connected to the 'strip. I tried a different 'strip and it does the same thing, but they are both pretty old powerstrips. Is this normal? Or would I be able to get rid of it by buying a new, good quality power strip?