Is Intel graphics disabled in bios or set to gpu(pci/peg, not igpu/auto) and monitor connected to graphics card port (not mobo port).
Used DDU to remove any previous card drivers ?
My PC- Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T.