My PSU went belly-up and I had another available. I put it in, turned everything back on, and within a second or two the second PSU was also dead. I received a replacement in a few days and replaced the latest dead one. The same thing happened - dead within a second or two. Yes, I shorted 14 & 15 on all of them - no response. But when I shorted the third PSU before installing it, the fan started spinning. After the installation - dead. What the devil is going on here? Anybody?