I also got the cooling unit for Trevor's computer. Christopher Drake had already supplied us a CPU, but it ran hot, so we hoped this would fix the problem. It was a bit of a pain to fit in the case (I had to temporarily remove the power supply to do it), but everything seemed to work fine. We checked it out and ran a temperature program, running it through a few paces as we did so. Everything was going great, so we played a co-op Starcraft II mission. Everything still ran fine and the temp was below 60 degrees C. Then, once we stopped, the computer turned off and has since refused to restart.
Trevor's bummed, and I have no idea what's wrong.