I believe there is one wire that powers the motherboard in that big bunch of wires that connects to the motherboard. It is a different color (green possibly) than all the others. You just need to connect this to any black (ground) wire. I could be wrong as I have never done this and I am color-blind so I can't really try it out myself right now. Wait until someone who can see right can give you a better answer.
By connecting this two wires you complete the circuit and then when you switch the power on the back of the PSU to on, the power should go. But do be careful and mind my warning above.
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