Actually I think the capacitor in the power supply blew up. I was watching a QuickTime video stream and all of a sudden I heard a really loud POP! I flew out of my chair! My girlfriend thought I broke my glass desk as she came running to the room wondering what the hell just happened. Sadly, my Quad won't boot. Off to the shop it goes.. I've heard of this issue happening before - mostly with dual core/quad core systems. For no reason whatsoever it goes POP and some people have seen blue sparks fly out the power button. In rare cases it gets smokey too! I've owned this machine for 2 months. I never had any problems and the only thing I've added since the day I bought it an additional 1.5GB of ram (Apple certified) for a total of 2GB and I added a 2nd SATA hard drive. The only thing that has changed since the day I bought it is I recently changed the Energy Save from Highest to Automatic. I did this thinking it would be a good thing.. It shouldn't cause any problems as all Mac system ship at this setting. For the life of me I cannot narrow down what the heck could cause a 1000W Power Supply to go POP! I have surge protectors on everything and the only other devices in the room using power are the 30" Cinema and a small lamp. Has anyone else experienced this or known anyone who suffered from the big bang?