Display not working after NVRAM flash

My Mac Mini late 2011 that was running on Monterrey with OCLP display out stopped working after NVRAM flash. Tried on another monitor (my TV) and boom, it works.

However plugging it back to my monitor still dont work. I have 2 monitors actually, same same (Lenovo Thinkvision P27 4k). The cables are fine. It's working with my other PC. I tried mini display port out instead of HDMI and also with 2 differents HDMI cables, it wont work.

Tried reinstalling / wiping everything on the HD, even the EFI OCLP stuff.

Tried resinstalling with an official Apple install USB disk.

Nada.

I'm out of solutions. Searched everywhere..

Any idea how to make it work again? Any help is appreciated!

Author: @Scoobidoooo