When I turn on my computer nothing happens. I tested my power supply unit and determined that it was dead. I ordered a new PSU and hooked it up and still nothing happens. But when I started troubleshooting connections I noticed that if I plug in my 24 pin connector, my DVD drive and my HDD but NOT the 4 pin cpu power my computer starts up fine aside from no cpu which pretty much means the computer is useless. I've built a lot of PC's, probably over 200, and I've never had this happen on a build before. I tried re-seating the cpu but that didn't do anything. I'm at a loss as to what's going on. I'm thinking that there's either something wrong with the mobo or the CPU itself or both. If anyone knows what this might be I'd appreciate some help.