I have a similar problem my Samsung UE40MU6100 will connect over wifi but not on a wire connection. Humax Box fine on the same wire as is my lap top. Checked the IP settings and the DNS server both in manual mode have done the factory reset, twice still nothing. Software update to version 1138. It detects when the cable is there so must be seeing something. I asked Samsung Online support and they said they would look into it, not holding my breath there. Any suggestions gratefully received before it gets put back in the box and John Lewis can come and pick it up as I guess the network card is bust.