Solid Red led (No Network) RAX45

Good Evening, hope all is well.  I purchased my router few months ago and was loving it.  My ISP is Comcrap.  In combination with the router, I am using nighthawk cm1200 modem.  I am the owner of a small business that relies on these devices and their connections.  Yesterday while working on business matter,  my internet service was interrupted and I lost all connection.  I panic and began to troubleshooting the issue..  I rebooted the router and modem, I call Comcrap to see if my area was experiencing service interruption, checked all cables and still nothing.  My router's Red Network Led was lit.   I connected the computer via ethernet cable from the modem and not router.  Voila! I was able to connect but not Wireless.  Thinking the router was defective,  I rushed to staples and purchased another router.  To my suprise, the new router was not working.  I performed test after test and nothing.  Ooops! I forgot to mention that at the same time that I got my Nighthawk router and modem, I return the leased Router Modem to Comcrap.