computer won't power up

[Madison Kelly]

Unplug everything from the PSU except say an optical drive (or an old 
hard drive you don't care about). This is because the PSU needs a load. 
Next, find pin 13 on the main header; This is usually the sole green 
wire, often a smaller gage then the rest. Short this to ground. Now flip 
the switch on the back of the PSU to connect the mains and see if it 
powers up. If it does, your problem is not the PSU. If it doesn't, the 
PSU is dead.

Pin 13 is the Power Good Line, this is normally shorted to ground by the 
system board/CPU when the initial ripple in line voltage has settled to 
protect the rest of the devices from damage. Hence why you don't want 
anything sensitive plugged in while doing this test.

Madi
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