I recently bought a new case that arrived in the mail today. As part of it, I bought a 400watt power supply. I got everything transferred over into the new case, got all the connectors on their appropriate pins, but when I went to power it up, the lights went on for a few seconds and then it turned off. I tried again after this, but the lights only came on for a second and the fans started to spin up, but then it turned off. Eventually, I tried turning the power supply off, unplugging it, turned off/on the surge protector, but I got to the point where it wouldn't go any further than the fans starting to spin up and then turning off. I even tried using the power supply from my old case with the same results.

If it turns out that I'm going to need to replace something like the motherboard, I'm going to be quite upset.