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Computer won't start unless I manually ground the green PSU control wire

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#1 macdonaldtomw


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Posted 05 October 2016 - 05:13 PM

Hey all,


My computer won't start unless I manually ground the green PSU wire (on the 20 pin connector that connects to the motherboard).


Once I ground the wire, the fans and lights and other accessories power up.


At this point I can press the power button on the front of the PC as per usual and the computer starts up.


If I don't ground the green PSU "on/off" control wire prior to pressing the on button, the motherboard powers up for as long as I depress the power button and shuts down immediately once I release the power button.


Is this a motherboard issue, PSU issue, or a power button issue?

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#2 bludgard


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Posted 05 October 2016 - 05:50 PM

I would definitely swap the PSU to mobo ribbon/connector PDQ. lol

Look for damaged/bent copper inside the interface.

Could be many things but it's a jump-off point.


Oh... and check that the fasteners anchoring the mobo to chassis are fairly snug.

Edited by bludgard, 05 October 2016 - 05:53 PM.

#3 JohnC_21


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Posted 05 October 2016 - 06:16 PM

Pull the power button connector to the motherboard. Short the two pins. If the computer starts  and stays on I would hazard a guess it's the power button.


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