With a modded Bios on RX 470/480 and 570 cards you need to use the AMD pixel patcher to bypass the signature check or you will have a code 43 error in the Windows Device Manager and they won't work. Most RX 580's don't need the patcher. Apply the patcher after installing or updating the AMD driver and reboot. If you are still having trouble, try removing the drivers in safe mode using DDU, install the latest AMD driver, apply the pixel patcher and toggle compute mode on in AMD settings for all the cards.
https://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-PatcherI just tried booting into safe mode through msconfig and now I only see a black screen and nothing else! I am connected to one of my video cards with HDMI and I can't get it out of safe mode!
As I said, if you modded the Bios on RX 570's they won't work unless you run the pixel patcher after installing or updating the drivers. Try connecting to the onboard video to get in to safe mode and run DDU to remove the drivers. After that reboot, install the latest driver from AMD and run the pixel patcher before you reboot.
I ran that program you sent me, then I went to run in safe mode but I only have a black screen. I will try using onboard video tomorrow when I can get a VGA cable.