Does it have power? (Check power and wiring)
Locate where the black Ethernet wire comes into the house (usually next to router) and ensure that it is plugged into a Black or White power supply (1in X 2in X 3in). Make sure the black wire is going into the port is labelled PoE and the light on the power supply is lit. The other port on the power supply is labelled LAN and has an Ethernet cable from the LAN port to the internet port on your router. Please ensure all the wires are correctly placed as variation will result in no internet service.