what are your booting times roughly? I do have the same board and since mojave it takes ages to boot, like several minutes. Also I cannot shut down the system, it always reboots. I usually just put it into sleep mode over night.
Ok, after a few restarts I'm back in the game. :D
All working fine now. Try to select macOS install drive instead of boot macOS from (your drive). Let it load, restart, then select your boot drive. Even with hard restarts, now it works.
may i ask a little off topic question about your audio configuration? I see you also got the VIA chip set in your GA-Z77X-UD3H. How did you solve audio then? The new methods all refer to the Realtek ALC chips.
ok, i basically hope to get rid of the black screen issue. I use multiple monitors. One way is to deplug all but the hdmi one if i remember right, but thats no viable solution in the long run. Has there been a proper way to solve this finally?
oh wow, without the third monitor my card runs at 658MHz memory and 123MHz core frequency. Thats quite a difference yea. I'll try to activate the iGPU but i think there were some issues with running both on sierra. I also suffer from the Black Screen issue currently.