"Network Cable Unplugged" usually means:
- The cable isn't plugged in properly at one end or the other.
- The port has failed at one end or the other.
- The ethernet cable is faulty.
- The wrong type of cable has been used - when connecting two computers directly, a "crossover" cable is used; when connecting a computer to a Hub/Switch/Router a "straight-wired" cable is used.
- If connecting two computers directly with a "crossover" cable, the network adapter in the remote computer has been "Disabled" in the Network Connections folder.