Installer on 2012 Mac Mini failing to boot

Hi folks, I'm wrestling with an odd problem in the lab and hoping someone has some insights. I have a 2012 Mac Mini (6,1 - Core i5-3210M) and I'm unable to get Alma installed on it, as I can't get the installer to actually boot. Thus far, this is what I've tried: - Alma DVD or Boot ISO on USB stick: Mac can see the stick as bootable, but selecting to boot results in a black screen. - Ventoy with Alma DVD ISO: Booting in "normal mode" results in the same as above (black screen). However, booting in "grub mode" gets me to the first installer-select screen (install/validate/troubleshoot). Any option selected from there, however, even "install in non-graphical mode", results in a black screen. Doing some searches online, it looks like Macs do something weird with EFI (a Mac doing weird things with partitions — what a shock, right?), so I guess it's possible that's messing with the installer. Oddly, however, a Fedora 42 install stick boots right up and happily installs on the same hardware without any issue. Anyone manage to get this type of hardware working with Alma? TIA, Jos
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Jos