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AT boards have a physical switch. There should be a label on the PSU showing which needs to be connected. It's usually 4 wires (could be 2, I guess) on it's own bundle (not the on the same bundle or wires for the motherboard or disk drives).
Make sure there's enough amps on the 12v rail. There's usually not as much amps on 12v available on AT power supplies.
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