The power supply and motherboard have a connection (4pin) that communicate to each other. Without this connection, the board will not boot and the power supply will not come on.
The power supply can be fooled by jumping certain pins, but the motherboard must be connected.
Please consult your motherboard manual for the location of this connector.
Visit this site for more clarification please.
http://www.pcguide.com/ref/power/sup/partsMotherboard-c.html
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