I've been messing around with it. I pulled it out of the cabinet and set it up on a different outlet with a different monitor. After blowing compressed air on the fans (which weren't dusty), I booted it up. It worked. I hooked it back up in the cabinet, but only connected the power and the monitor. It worked. I was about to plug in the mouse and keyboard when it shut off. I think I was leaning on it when this happened. I couldn't get it back on. I once again pulled it out and when back to the working setup. This time, it did not work. The only difference was that it was standing up. When I laid it back down on its side like it initially was, it worked again. Which leads me to believe to that something happens to make it not work standing up. Any ideas on what could be causing it to not work standing up, or am I just jumping to bad conclusions.
Also, about to run memtest.