I just had an insane 2 days battling with this Mac Pro to install Sequoia. I have installed OCLP/Sequoia on at least 5 other Mac’s of this age including another Mac Pro, and have had no where close to the issues I had with this one.
I figured I would share my experience and how I ultimately was victorious.
I created a bootable USB installer with another Mac using the target mode for Mac Pro. I then was able to get to the bootloader screen and select EFI, and go through the process to start the OS install. Time after time it would get half way through the initial install (10-14 minutes remaining) and then crash to a black screen, not responding to any commands (caps lock didn’t work) though the Mac and display were still on. I had to hold down power to force shut down, restart, and go through that process several times, taking breaks as the trash can was getting pretty hot. Finally, it would get past the initial screen and move to black screen with Apple logo and the progress bar at the bottom. Again, it would get about halfway, then freeze to black screen. I did let it sit for long periods of time but it was clear the Mac wasn’t responding or doing anything. So I continued through this process, forcing shutdown and rebooting. It finally got to a point where it would boot to the installer. Same progress and freeze to black, but after several attempts, it FINALLY chimed - to a black screen. Held down power again, let it reboot, and to my shock we were at the Sequoia set up screen.
Everything was pretty straight forward from there installing to disk and root patching.
I hope this helps anyone who experiences something similar, the persistence did pay off. It took a lot of patience and I was doubting it was working, but it finally did.
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