I just got a new 3GHz Mac Pro and I've discovered that the clock runs fast. It's off by a few minutes every hour and I need to constantly go to the Date&Time control panel to automatically set the time. This seems to also affect QT playback - when watching a long video in full screen mode, it'll shrink back to normal size a minute before the video is done playing. This is about the same time-offset as the clock. I don't even know where to begin debugging this problem. I posted on the Apple discussion boards but all I got were replies wishing me luck. Does anyone have any advice?