I have. 3,1 Mac Pro with a radeon R7 260X 2GB installed, it's a Sapphire card
. It provided an output in High Sierra, which I used to install Monterey, in which it also outputed video.
It booted into Monterey, I got through the setup and installed the opencore app. It installed the EFI, and told me to reboot. Now, I just get no output, be it with the R7 260x or a GTX 750.
I'm pretty sure I saw Lilu and Whatevergreen on the EFI install log. I can't even boot into the installer now.
According to the opencore site, it should be compatible up to Monterey, and some sources even say it' "native".
What happened, and how can I fix it WITHOUT going back to El Capitan, patching High Sierra and then remaking the installer all to try again? It took like 5 hours to get to this point.
I can't seem to boot into safe mode by holding shift. And a pram reset didnt do anything. I tried reseating the ram rizers, power cycling it and even removing and changing the CMOS. I really need this mac pro to work.
What do I do?
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