Hi guys, I have recently brought the 27" quad core iMac (the top model) and had it since Tuesday. Just now really the computer was showing the screensaver and I pressed esc to wake it up and it made this huge snap/bang. Scaried the crap out of me! Straight away I had the feeling it was to do with the sound so when I tried turning it up and playing iTunes music and no sound. I panicked and put it to sleep, I re-woke it and the sound came back just fine. I thought it was just a one off and so continued using the iMac and listening to the music but then it did again. I have now switched it off as i'm now worried the sound has blown. Anyone got any ideas what's going on? Also need to say I can't just get it fixed from apple as I'm gonna be heading back to Uni pretty soon. Thanks!