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isolate the problem first, if on the load or the power supply unit itself. remove all load connections. make the power supply turn on normally by bypassing the "p-on" from the main board by connecting from the always available 3.3v or 5v thru a 10k resistor from the power supply, then check now if 12v is now 12v then the problem is on the load, focus repair or replace motherboard. but if 12v is still 6v then your power supply is the problem that need repair.
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