Reuse PC Power Supply

To reuse PC power supply without motherboard, you have to short 2 pins on the 24 pin ATX power connector which is the connector that connect to your motherboard. To know which pin to connect together, you can refer to this site which has a detailed pin layout.

As shown in the diagram below, you need to short pin 16 (power Supply On) and pin 17 (Ground) together and this have to stay there as long as you want to use the power supply. Please take note that there are few other ground pins and i choose pin 17 is for convenient.

Picture below shows my setup and i use DVD ROM to test out the power supply.

A closer look on the 24 pin ATX power connector with the cable to short pin 16 and 17.