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I swapped out my old Nvidia 950 with an RX 580 so I could finally make the leap from High Sierra to Catalina. I also decided to do a "dry run" on a blank HD before I tried updating my current install, just so I could reverse everything if things didn't work. My system: Gigabyte GA-Z170X-UD3 ATX...

GA-Z170X-UD3 GTX 950 Everything was working correctly under 10.12.1. After doing the update and rebooting, I updated the Nvidia web drivers and rebooted again. Now I get the monitor going to sleep before the boot finishes. Looking at all the guides, I seem to have my config.plist edited...