The hits just keep on coming with this thing First, it arrived with a massive glob of dust trapped between the backlight and LCD panel (still need to take to Genius Bar), then the PSU buzzing started and now it's making a random clicking/popping sound from the lower left. Its a very quiet sound but its noticeable in a quiet room. It appears to be random, but I can reproduce it by opening iTunes, playing a few seconds of a song, waiting at least 10 seconds in silence, then starting another song. *pop* and the song begins. This happens in QuickTime as well. What is going on here? I'm so exasperated right now, I wish Apple would just replace my troubled machine with a new one.