My stupid ass misread the qvl list. My ram was compatible BUT because of my cpu only compatible single dimm, dual or 4 WASNT compatible.
So problem fixed
Just took apart my built to upgrade the mobo from a b550f. Everything was working perfectly with the b550.
Install a rog crosshair hero viii in, swap all the ram and m2.
Pc won't boot, black screen, yellow light at dram, error code 0d.
Updated the bios from USB, ram aren't faulty cause they were perfectly fine 5 minutes before. I removed the cmos battery for 5 minutes, and still the same problem.
I don't know what to do next, feel hopeless because mobo is out of warranty since 1 month ago.
Edit: Doesn't boot with a single ram in B2 but will boot with single ram in A1. Tried loosing up on the aio also
As you're dropping a memory slot, I would go a step further than loosening the cooler and reseat the CPU - check CPU pins also.
Also, ensure the motherboard stand-offs are not over-torqued surrounding the CPU array.
Failing that, remove the board and test out of the enclosure.
No broken pin on cpu
Back on with less pressure on the aio mount.
Able to boot with ram in A2
Bios put in default.
Doesn't boot in dual (b2 and a2) 0d code comes back
Able to boot single ram with docp activated
I'll try to update the bios again now that I can boot it in single ram