Troubleshoot Power Issue

instinct95

Prominent
Dec 30, 2017
3
0
510
So my friends computer started doing some clicking and after some research decided it was either the power supply or HDD. It would boot a while and then turn off relatively quickly so we RMA’d the PSU since it actually did boot one into the OS. When I received the PSU, I plugged everything back in to the PSU and tried to boot it up. To no avail. Now I wanted to see if it was dead on arrival, and plugged the PSU into my main build just using the Mobo and CPU power connectors and worked fine. So the PSU works 100%, so what could be the problem when it would work (or at least power on) before RMAing and now it doesn’t work with the new PSU? Mobo/CPU/PSU is Gigabyte H77-N ITX/i5 3750K/Cooler Master V650