Reuse that old supply

You can use a old supply to run devices such as a water cooling system or anything that needs 12 volts by following the steps mentioned below.

This is also a good method to test a supply before you plug it to the main board.

Using something such as a thin wire/paper clip, short pin 14 [PS ON] for the 20 pin connector or Pin 16 on the 24 pin connector to any one of the pins with the black [ground/return] wires.

There are no voltages that can hurt you on any of the pins but if you short the wrong one you could blow out the supply or trip a breaker.

The first ten pins from the orange wire end are the same for the 20 and 24 pin connector Just that what is pin 11 for the 20 pin connector becomes pin 13 on the 24 pin connector. Shown below is a 20 pin connector.



More resources:

http://en.wikipedia.org/wiki/ATX