I was wondering if anyone knew a solution to this problem. I thought it was only with my itunes, but last night watching a dvd, the same thing happened. I saw a previous post with the same issue, but I couldn't get a response, so I thought I would start a new thread. What happens is the general sound from my powerbook starts to skip and get progressively louder for 5-6 seconds (almost like it is dubbed out) and then goes back to normal. It happens while I'm listening to itunes, and last night, it did it to the sound from the dvd. I went to the genius bar at the apple store about it, and they had never heard of it (and it wasn't really the kind of thing they could sit and wait for, cause it happens randomly). If anyone has heard of this, or has any solutions, I would be more than grateful. It tends to ruin the flow at the most inopportune moments! thanks.