Switched from a 1060 to a 7800xt.
Issues with black screen started happening on the restart after AMD drivers were installed.
Windows would not start up (no signal) if the hdmi was connected to the gpu, but would work fine when connected to the motherboard.
I followed the switchover procedure fully (DDU, BIOS reconfig, etc).
Spent a day debugging to no success.
I gave up and opted to reinstall windows (and formatting my SSDs), twice.
First reinstall was with the HDMI still plugged into the motherboard. When switching the cable to the GPU, it still wouldn't work.
Second reinstall was with the HDMI plugged into the GPU. Installation worked perfectly, and GPU is now fully functional.
Experience rating 2/10...