Just a little note to tuck away for future reference. I added another 2gigs of ram to my MacPro yesterday, and found that it would no longer wake from sleep. I’d just get a blue screen that wouldn’t go away. I ended up solving it by manually reseting the SMC via the button on the motherboard. I think that the issue occurred because I didn’t unplug the computer while swapping the ram. Because of this, it was never without power for the requisite 15 seconds that it takes to drain and flush the SMC normally.

In any case, after resetting the SMC, all seems well. I think.