Your monitor might be connected to the motherboard instead of your graphics card, and the fix takes only a cable swap.
You may have a great graphics card in your gaming desktop and still be disappointed with its performance because of where the monitor is plugged in. Many PCs have HDMI, DisplayPort and USB-C monitor connections in two places: on the motherboard and on the dedicated graphics card. The same cable can fit either set of ports, which isn't particularly helpful.
If your desktop has a dedicated graphics card, the monitor should normally connect to that card's outputs. You may end up with less capable integrated graphics or a blank…
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