Hi. Yeah I bought a new PSU for my Dell E520 after reading in several places across the web that a CX450W worked for other people. My problem is that when I look at the wires on the motherboard I see one wire from the PSU has only four pins. The one on this new one has no 4-pin wire coming out of it; it has that big one there with the 24 pins, that one's fine. The one I think is for that 4-pin thing has no matching plug on the PSU. This is an ATX unit, I don't understand why it would be any different if it worked for other people, Any ideas? Am I supposed to use one of these other plugs from the newer PSU? There is the big one, there's one with 8 pins and another one with 6 that has another two sprouting off from that like some optional wire or something. I think the 4-pin plug on the MB is for the CPU it sits right next to it on the MB. Any tips?