Wow, thanks a lot, Jacadcaps!

I plugged the screen of a G4 in the second output of the graphic card and I can see OF! I can see again

Still no luck with the booting though... I'll share a screenshot of the variables but I realised something: my "hd:," was set to "/ht/pci@7/k2-sata-root/k2-sata@0/disk@0". This disk is not ATA. When I'd execute "dir hd:,\\", OF would say "not a ATA disk". My boot disk is "/ht/pci@7/k2-sata-root/k2-sata@1/disk@0" (on the second SATA port?).

I managed to change the alias of "hd" in NVRAM by "setenv use-nvramrc? true" and "nvalias hd /ht/pci@7/k2-sata-root/k2-sata@1/disk@0", but it still doesn't boot automatically.

I also "setenv boot-command boot hd:,\\bootinfo.txt", but it still doesn't boot automatically.

So I don't know what's happening, because "boot" or "mac-boot" from OF boot MorphOS no problem...

Cheers!