Connect miniMac to monitor LG 27MD5kA monitors

Only the 2018 (sometimes called 2020) Mac min has USB-C ports, and they are also Thunderbolt 3. There should be a lightning bolt icon next to the ports. The cable should also have lightning bolt icons on its plugs.

Make sure the display end of the cable is plugged into the display's Thunderbolt 3 port (lightning bolt icon), not one of the display's three USB-C only ports (no lightning bolt icons).

Use one of the Thunderbolt 3 ports with the Thunderbolt 3 cable that comes with the monitor.

If the Mac mini is older than 2018 it can't use that display.