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The PSU is turned on by the motherboard, which is turned on by the ITPS. To force the PSU to turn on without a motherboard you need to ground out pin 14 of the ATX power connector, usually the green wire.
The red and black wire from the ITPS connects to the place on the motherboard where you would normally connect the power switch, not to the power switch itself. Shorting the wires from the ITPS will have no effect, shorting the terminals on the motherboard will (provided the motherboard is hooked up to the PSU.)
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