Hello.
PC Specs: Rx6600, i512400, win10, B660M-A D4.
I can't use two of the three monitors I have, except I use safe mode on Windows 10:
Monitor 1: Old LCD screen, works fine on normal bootup and also safe mode
Monitor 2: A realtively modern 75hz samsung display, only works in safe mode
Monitor 3: A 32 inch led samsung TV, only works in safe mode
They're all conencted trough HDMI, one at the time, obviously.
I've tried: Updating bios (motherboard), reinstalling windows, replacing HDMI cables, rolling back drivers (Didn't tried them all, but 2 or 3)