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How to turn on ATX PSU without connecting a motherboard ?

It is sometimes necessary to power on devices and use an ATX power supply without actually connecting and booting up a motherboard.

You can turn on ATX power supplies by connecting a short wire/paper clip between the green (/PS_ON) wire on the large 20/24 PIN ATX connector and ground (black wire). The green /PS_ON wire is pin 14 on 20-pin connetors, and pin 16 on 24-pin connectors.

The power button on ATX cases goes through the motherboard, but still shorts that /PS_ON wire to ground when pressed.

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