Red switch on the back of the PSU
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You can safely test it by setting it to 115, flip the switch to I (if it has an on/off switch on the back side), then with a bent paper clip short pin 16 and 17 -- the green power on to a black ground. If the fan starts up and it doesn't have an odd (burnt bakelite) odor it's okay. It is safe to do this with the green wire, but don't do it with any of the yellow or red wires, those are the 12V and 5V power wires.
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