The audio output from the Z390 Gaming X board was fixed using the method by
Bleyses in his guide “Solved > Catalina easy update and sound fix found in Forum > Install
Catalina Desktop Support
Part of his audio fix includes a Sound Fix attachment which uses:
AppleALC.kext
AppleHDA.kext...
to llambeau
If after macOS Mojave is initially installed from your installer Mojave flash drive unto your system ssd/harddrive and you have a black screen after a boot, try a reset to restart the computer. Redo load Optimized Default and followup BIOS setup. Save and after restart, select...
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