Quote from: velma on May 13, 2021, 11:14:27 PM

I'm running a RX 580 rig with six video cards on a Z270-a motherboard. Two of the cards stopped working, so I checked each one out separately in a PC I have, and they operate and mine just fine. I also tried other power cables from my PSU that are working correctly with other cards, but the fans would not spin.

I also changed the risers for both cards. That is all I can think of that could be causing problems. Any ideas why they are not working? My only thought is bad risers, which I will change, but wanted to get opinions if I am missing anything.

Try to put not working one into the the riser with GPU mining.
GPU is ok, you tried that, but mostly risers are bad, or power connectors are fried.
PSU is a modular one?
How many risers conected into one wiere?
Risers conected to 12V trough MOLEX, SATA, PIN6 ? Any extenders SATA->PIN6 etc ?
Did you checked the PSU ? If it`s modular and 2 not working GPU are connceted through one cable - socket may be fried.