I got my dead internal display to work with an external display on mirrored mode, and I got it to reliably boot past Apple‘s incredibly finicky AMD graphics drivers.
I ordered a bottle of Jim Beam, and I’m going to bed. I’m fucking exhausted.
If anyone wants to offer further advice, go ahead, but any Apple bashing will be firmly ignored because I just don’t have it in me to take it


Why’d it take 8 hours?
I had to take breaks. Or I would have smashed things.
Realistically, though, it’s a 2012 iMac, so I’m working with USB 2.0 flash drives and SATA 3.0 HDDs. Shit is old and slow. Plus, because of repeated Radeon driver bugs, I got caught in so many repeated boot loops, I lost count of how many. So, so many boot loops.
Repeated grub and refit problems… Apple efi vs refit, etc, and manually editing the boot efi… Apple ago is so weird. It’s such a nightmare to navigate blind because you can’t edit it, nor even look at it, and it’s unpublished. It’s just trial and error.
Just put sata ssd on it and it will feel like a new machine