Problems with setting up

I am trying to set up this router and everything seems to be working, the modem lights are all green and I can hardwire to a computer and get internet. The router power, internet, WiFi, and wps lights are solid green too. I can connect to the WiFi but there is no internet when I do. I have tried registering on the website and the nighthawk app and both end up saying there is no internet connection. Why is there no internet when both the modem and the router appear to be working correctly?