First step (Hello World of hardware), light a LED, well in this case one of the 12v lights from the donor car. Well, you can if you figure out how to turn on a ATX power supply without a motherboard. Google took me here. http://www.instructables.com/id/How-...-without-a-PC/
Here is what he said .....
Just look after the green wire in the cable tree from the PSU.
Follow it to the 20 or 24pin ATX plug.
The green cable is what enables motherboard to power up the PSU
Jumper the green wire on the ATX plug to any other BLACK wire. Best practice you should connect the green with black besides the green.
