computer won't power up

[Lennart Sorensen]

On Thu, Jan 22, 2009 at 03:41:30PM -0500, Madison Kelly wrote:
> 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.

Pin 13 is ground.  Pin 14 is PS-ON.  Shorting PS-ON to ground makes an
ATX power supply turn on.  If it is not shorted to ground it turns off.

So shorting pin 13 to 14 should make it be on.

Power-OK is pin 8.  Don't mess with that.

-- 
Len Sorensen
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