I just got my first ever Mac, the new 2.53 15" UMBP. Love it. One odd thing though. When I log in it makes a series of sounds which can only be described as sounding like a kazoo. Very buzzy like a piece of paper or the world's cheapest little speaker. It buzzes a series of sounds then stops. This happens every time I log in, open/close the lid, etc. Audio is fine on the device. It plays songs and video sound tracks quite well. The startup chime plays fine, too. It kind of sounds like a cricket stuck under some wax paper. Is this, uh... normal?