I have a 3080 graphic card that wont displayed on the monitor, I tried few Hdmi cables like 2.1 and the old HDMI but no display still, the funny thing is I can get display straight from fhs the motherboard only or if I insert a older GPU like 1060 I get a display, what should I look into next.
In the BIOS of the motherboard there is an option Graphic Adapter Priority, where you can select the GPU priority - built-in or discrete GPU. You may have an old motherboard that does not recognize the new RTX 3000 series graphics cards.