I'm one of the folks who got an early 2008 MacPro, ordered the day after they were announced. Besides the 8800 GT card, I also have 4 GB extra OWC RAM and 2x500 GB WD hard drives installed. My problem (and I tried searching, didn't find anything) is that it I accidentally bump the tower, like with my knee since it sits under my desk, it will restart. I've tried padding the side that's up against a leg of my desk, but it still restarts. It has nothing to do with what's currently running ... just if I bump it, it restarts. Is this a known problem? Is there a fix for this? Or is this a return-to-store issue (along with my monitor, which has a glow in a corner)?