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Power Issues with a home build

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Hello everyone. First time poster here. Having trouble with a home build.


Gigabyte mobo > MB GIGABYTE|GA-MA785GMT-UD2H 785G R
EVGA graphics > VGA EVGA 512-P3-N954-TR 9500GT RT
Thermal take PSU > PSU TT|W0116RU 750W RT
AMD Athlon processor > CPU AMD|ATH II X4 620 AM3 R
4g Gskill ram > MEM 2Gx2|GSK F3-10666CL9D-4GBNQ R
Seagate hard drive > HD 500G|SEAGATE ST3500418AS

Whenever we plug anything up we cannot get power. We have tested the power supply and get fans and CD drive to work when it is not plugged into the mobo. However, once plugged in we get nothing. We returned the mobo thinking it was defective, but now the second mobo is having the same issue. We have double checked all installation on the mobo and it is done correctly. Is there some sort of compatibility issue with PSU? I've been looking around the internet and have not yet found any such case.

Any insight would be appreciated and thank you in advance,

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Had the same problem on my last build, thought it was the psu, but turned out to be the fromt panel connections.
Check to make sure you have the connecters on the right pins.
On my build, Pins indicated on the mobo instructions were different to the case instruction.
If after checking, still no luck, try.
Turn off the power, remove the connecters from the fromt panel mobo header. Turn on the power and with a small screwdrive short out the two pins that are indicated as power switch, if computer starts, short out the two pins indicated as reset.
Turn off the power and connect the two connecter,,,, Make sure the coloured wire goes on the + (posative) and then test. Turn off the power and connect the remaing connecters.
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