The sproggy really shouldn't need the PS_ON pin, it's just to tell an ATX supply when to turn on.
Use a multimeter to check all your voltages and make sure they're ok, my 5V line was dropping too low (like 4.5v) so I had to add a linear regulator on the HDD.
You might have to push the power button to get it to turn on while hooked to the sproggy too, some motherboards are weird that way.
Hope this helps
-Jon



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