Monitor connected to graphics card, mobo bios settings (initial display first(or similar wording) on auto/pci/peg, not igpu) ?
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.