TrueNAS SCALE installation - no video output after grub

Ok, I solved the issue, and as always it was due to user error.

Basically by reading documentation online I came to understand that AMD Integrated Radeon Graphics works by reserving a memory buffer in RAM. Such buffer cannot be allocated by the OS and is reserved to serve the CPU graphic workloads.

I then looked at the memory details in the BIOS and noticed that by mistake I added my two DIMMS slots to A2+B2 slots, while the recommended occupation for a two-DIMM system is A1+B1.

Even if it seems irrelevant during installation of any other OS different than TrueNAS (in the course of this issue I tried installing both Ubuntu 20.04 and RHEL 9), it seems to mean quite a lot to TrueNAS.
Switching to a A1+B1 configuration magically made the text installer process popup after grub without the need of any other tweak, and now I’m ready to spin my new NAS hardware.

Thank you to everyone tried to give me any additional pointer of suggestion, I now have to understand how to mark this thread as solved.

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