I just got an RX 580 pretty cheap, installed it and it booted up fine. I am using the lastest OCLP and I have Big Sur installed on my 5,1. I noticed that the boot picker wasn't visible so I turned on AMD GOP injection and rebooted. Now I can see the boot picker and the Apple logo while the machine is booting, but after that the screen is blank. I can tell it is on because File Sharing is on and I can see the files from another Mac. Is there any hope of fixing this or do I have to nuke it and install again?
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