It sounds to me that it is your power supply also. From the sound of it, it is not passing the Power Good signal to the motherboard, which is why it is not attempting to even boot up. If you have a power supply tester you can verify. Of course I have one here, but I don't think that will help too much, unless you want to visit me Old Man!!!
I am in the process of setting up my new Dell desktop just for MWO. I went crazy. But in the end I think it will be worth it as I keep my desktops running for 5 years.