A1200 tower PSU issue - help

[som99]

Take a picture, a lot easier to give answers then when we can see how you have done, an ATX psu needs a on signal to start, you do that by taking the green wire from the 20/24 pins motherboard connector and connect it to any of the ground cables (black ones), try with a paper clip green to black. Also the negative 12v is the blue cable on the 20/24 pin connector.

[som99]

Well blakespot can use whatever PSU he can find, just cut and solder from PSU to your connector so any ATX PSU will do, don't forget to use activity/on (green wire) with your power button to ground.