RAX 80 Not Connecting to the Internet

I just purchased the Nighthawk RAX 80 and went through the set up process, but my router is not connecting to the internet. I checked to see if there is any issue with internet because of my modem (Arris TM 822), but there is no issue when I connect the modem directly to my laptop, for I have internet connection. I am able to connect to the router on my computer and phone, but in both cases there is no internet connection. I spent time with technical support to troubleshoot my internet problem. We reset the router, checked the ethernet cord, checked the power source by switching to another plug,and  unplugged the modem and router. We even checked to see if there was any light on any of the LAN ports on the router, and there was none. The technical support concluded that Internet and LAN ports were defective and therefore I should return the brand new router for a refund or another RAX 80 router. While I understand that products may be defective, I am not sure if there may be some other reason why I am unable to connect to the internet via my router, given that others seemed to have some similar problems. Any help would be greatly appreciated.