I fear the thing is trying to communicate with me, and even my 17 year old son can't figure this one out. The Mac does a 3 beep ding sound all the time. It sounds like the 3 tone warning before photo booth takes a picture, but that application isn't open. I though maybe related to the said teenages ichat, but that isn't running either. I keep the volume muted so I don't have to hear it around the clock, but what the heck is it??