P1 bringup: Power supply always ON
The switch uses a standard ATX power supply.
To turn ON an ATX power supply, pin 16 (PS-ON) must be connected to ground and must be kept connected:
As we can see, on the switch, pin 16 is permanently wired to ground:
This implies that the power supply will always be ON when it is connected to the switch and to the mains.
There is no way to turn off the power supply.