Now it's time for the wire. Bend the wire and close up the little green plug from the big ATX plug to any other BLACK plug. Cause the black is the ground. To come off best you should connect the green with black besides the green.
Your PSU should power up immendiatly! You are done! 2 Notes:
Use a thicker cabel for this. a standart one will cause a loose connection witch isn't good for the PSU.
When you do this make sure that you have some device(s) connected to the PSU. Otherwise your PSU tries to drive the non-existing device an will overheat.