How to test your ATX power supply without using motherboard?

What you need is  a wire to use as Jumper

Next you have to determine  which hole to connect the jumper. just take a  look at picture below.

When you found which part to connect the jumper,  just connect it.. and switch on the on/off button at the back of the ATX casing to  test..  ( dont forget to switch on the main switch (socket) too)

This should power up the ATX casing unless it is faulty.
Just like that... So easy..
Good Luck...