On all my applications the sound is unsynced with any video that is playing. I could be playing a dvd in dvd player or watching a trailer in quicktime or vlc or a video on youtube, and the sound is always unsynced to the video by about half a second. This problem has being around for a while, i presumed it was because i was listening through my stereo and that was the problem but i was listening through the iBook speakers and the problem was still there. Any ideas? Thanks.