Is the monitor connected to the graphics card (not the onboard mobo socket).
Now that you've added a dedicated graphics card, the APU graphics is obsolete.
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.