Installed Windows update last night (Win10 64 bit on Haswell-E system with Samsung 4K monitor). System kept going to black screen. Windows recovery options didn't help. I had to boot into safe mode, uninstall device, use AMD clean remove utility. Any reinstallation of driver caused the same issue. I tried Windows WHQL version, latest 17.4.2 version, older 16 version. Same with all of them. I was able to source a RX480 card and it worked immediately.