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Power supply has a short on the four prong plug for the cpu board. the four wires that goes to the cpu board are as listed black wires and two yellow wires. with this plug unplugged the computer turns on, but with it plugged in the computer doesn't even power up. which could possibly mean that this plug is causing some sort of short. the plug is located by the fan that is mounted over the cpu board if you are looking down on it while it is lying on its side. if so then the location of the four wire plug is exactly one inch below the left most rear corner of the fan. thats if you are looking at the pc with the base of it facing you. please help!!!!!

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Sounds a lot like the auxiliary power for the other parts of the board..replace power supply

Posted on Oct 09, 2008

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As you've noted you need two Black wires (Ground), and two Yellow wires (12 Volt),
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http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

If you are not using the 6-pin PCI Express power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress

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Splice the wires of the 6-pin PCI Express to them.

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Or if you have a spare 4-pin standard Peripheral power cable from the power supply,

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

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