When the screen goes black, the discs are still spinning. It's just that we can no longer see anything on the screen. My hard drive is like yours. A NVMe Firecuda. I installed exactly the same config as you except the 5700xt. On the other hand, I tried your first EFI Sonoma this afternoon, and I managed to boot on the key. I managed to install Sonoma on the Firecuda, and on reboot, in the bootloader, when I choose the firecuda, I have the Apple then it turns black. I tried to reboot again on the key to redo the manipulation. And it made me like at the very beginning, Apple and black screen (without being able to access install Sonoma).