Wan Light: If the light is off, this indicates the router is not getting a connection from the ONT. Make sure the ethernet cable is plugged into the WAN port of the router. Re-seat both ends of the ethernet cable to ensure a strong connection. This would be a good time to swap the ends of the cable. If the WAN light is on solid or blinking, you now have an active WAN connection.
Bypass Router: If you have a device that has an ethernet port (Laptop/PC), you can bypass the router and connect the ethernet cable directly into your device to test connectivity This will isolate and determine if the issue is with the router, ethernet cable or connection to the InterBel network.