Mojave to Catalina upgrade - no DP or HDMI output from RX 580.

Recently upgraded to Catalina and have run into an issue that seems to be common, however the obvious fix (WEG update) doesn't work for me.

My system has been running stable all the way up to 10.14.6. I upgraded to Catalina and the entire upgraded process happened in "silent" mode, i.e. blank screen, I couldn't see the progress of the update.

Once the upgraded completed, I'm presented with the Apple logo, the progress bar shows for about 1/5th and the screen goes blank.

SMBIOS: iMac 14,2

Mobo: GA-Z97X-UD5H-BK

CPU: i7-4790K

GPU: AMD RX 580

submitted by /u/ic3m4n81
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