Q: Ethernet Not Connected - Cable Unplugged

Hi,

I have new Mac Mini (Late 2014) running OS X El Capitan version 10.11.3.

I was able to connect to the internet properly using wired connection. However, after the last reboot I've made, I can no longer connect and when opening the System Preferences --> Network I see Ethernet Not Connected --> Cable Unplugged.

The issue is that the cable is plugged, and the network works properly for other devices. I tried to use another network cable and to switch to another port in the router, but nothing helped (the same ports and same cables work well for other devices).

The WiFi is working fine.

Any thoughts on how to resolve this annoying issue?

Thanks in advance