A friend and I are building a small stable of Mac Pro units to do video editing/rendering. We can get these pretty cheaply and they do a great job for what we need.
Problem is that while some of them easily upgrade to Monterey with OCLP, we have run across a couple which are seemingly identical to the others but won't boot the installer. Last week we encountered both a 4,1 (upgraded to 5,1 firmware) and a native 5,1 machine which will not boot the USB installer. The machine starts to boot from the USB and then seemingly hangs (there is no video till the installer actually launches because we have standard RX580 video cards). We built several installers on different machines, and no success getting them to work on either of these boxes. In the past, we've been able to upgrade other 4,1 and 5,1 systems fairly readily.
The strange thing is that we did install Monterey on the 5,1 machine last year with essentially no problems. We were likely using an older version of OCLP at that time. The latest version doesn't seem to work. The 4,1 machine has 16GB of Apple RAM and the 5,1 has at least 96GB. The 4,1 is currently running Mojave with zero issues, and the 5,1 as mentioned already has Monterey installed - we were hoping to build a bootable HD on it and transplant it to an identical machine.
Is there any possibility that there's a problem with the latest OCLP package? Are we running into a quirk with these machines that I can try to track down? I stripped out everything except the video card and RAM to see if they were interfering, but that made no difference. I'm still trying to troubleshoot these machines, but I've about run out of things to try.
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