z390 Aorus Master F11n
Corsair 4x8 Vengeance RGB Pro
MSI 3080 Suprim X
So this seems like a very unfortunate situation which started after I've updated my mobo bios to the rebar support.
Then, ran the MSI live update to download the vbios for the 3080, ran the file (162.exe), prompted me in cmd to accept, did its thing and rebooted the PC.
No video signal to monitors afterwards.
Windows boots just fine based on the sounds it makes, just no signal (not even boot screen)
Tried switching the GPU silent and gaming switch and circled between all