Also work up to a rig that was down from a MSI RX470 being shorted.  EVGA PSU are very smart, if there's a short.  It will not power back on until you remove the power connection to that GPU.  So I have to isolate which one and in order to get the PSU to turn back on, I have to remove the MB cable and plug it back.  After that I take the shorted GPU and I bring it to my Corsair to power it up and end it's Life fast as that's when the GPU WILL sizzle and goes to smoke.  After that it's RMA time.