My new powerbook (rev e) has this weird sound issue. About once every half hour if a song is playing the sound will loop for about 4 seconds while growing in volume. After that the song resumes playing normally. It sounds like a cd skipping. This is not just limited to itunes, I also had this issue watching a movie using quicktime. This issue seems to have appeared in the last week or so. Maybe it is a 10.4.3 issue? After turning up nothing here, I searched google. It turned up a discussion at Macintouch. I also found a topic in the Apple Support Forum. Here is a quicktime file of what it sounds like. This is from Aspenboy in the Apple forum. Since it is hard to describe what it sounds like, this file should help. So have any of you encountered this problem or better yet, found a solution for it?