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I'm not sure, but I think:
you can test the PS by shorting two pins on the PS connector that goes to the motherboard. This should start the PS fan. Sorry, I don't know which two pins on the PS connector you short. Maybe Google for more info.
Then I guess you could check with a meter other pins on the connector for voltage relative to one of the ground pins.
This bypasses the logic function on the MB that would switch these two pins.
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