Plug in your monitor, open a terminal window and run `xrandr` (if you're on X-WIndows) or `ddcutil detect --verbose` (if you're on Wayland). This should tell you if it's detecting your monitor at all. You may need to install the packages that provide these commands if they're not on your system already.
There's probably also a display settings GUI that you can try, but I'm not sure how that works on your particular distro.
There's probably also a display settings GUI that you can try, but I'm not sure how that works on your particular distro.