I bought a new Seasonic Prime PSU last week because my old PSU's fan was getting loud, and it was going to take a couple weeks to warranty it (I use this PC for work occasionally so needed it up sooner). I'm an experienced PC builder and installed it yesterday. When I pushed the PC power button nothing happened. I then unhooked everything, removed the PSU from the case (everything was unhooked), jumpered the start pins, and it still wouldn't turn on. I pulled out my DMM and verified the AC power code was showing 120v plugged in. Then I tested a few pins in the 24 pin motherboard connector and found that not all of them appeared to be powered up. I found only one 5v pin and one 12v working (I very well might not be doing this right, but I know enough about basic electronics to keep one of the DMM leads on a common pin). I tried it with both hybrid mode off and on.
To compare, I then hooked up the old PSU (EVGA SuperNOVA G2) and tried powering on the the PC, and again nothing happened. I took the old PSU back out and tried jumpering the 'on' pins and the the old PSU won't start now. I have never run into this issue before, so I'm not sure where to go from here. Is it possible the motherboard is bad and frying the PSU's now?
To compare, I then hooked up the old PSU (EVGA SuperNOVA G2) and tried powering on the the PC, and again nothing happened. I took the old PSU back out and tried jumpering the 'on' pins and the the old PSU won't start now. I have never run into this issue before, so I'm not sure where to go from here. Is it possible the motherboard is bad and frying the PSU's now?