No Internet Connection after Factory Reset

[JoeChillers]

About a month ago, I bought a router to hook up to my modem. I used the Nighthawk app to help hook up the router and give off internet. The router worked well at the time. Just now I had to reset my internet connection although I accidentally factory reset my router because I held the reset button down for too long. I go to hook up the router again, but this time it says that my connection is secured but with no internet. I go back to the Nighthawk app to set up the router again, but they want me to scan the QR code from when I first bought the router that I no longer have anymore. I choose to set it up manually, but I end up with the same results: Secured, No Internet. I made sure cellular data was turned off when I tried connecting to the internet off my phone and the connection still gave me those exact results.

[plemans · Accepted solution]

try factory resetting both the router and the modem. 

[plemans]

What modem do you have?

You have the rax40? 

[JoeChillers]

Yes, the model is the RAX40

[plemans]

What modem do you have?

[JoeChillers]

ARRIS Touchstone CM8200

[plemans]

Anything else connected to the cm8200? 
it has 2x ethernet ports but you can only connect 1 device to it. 

[JoeChillers]

The only other device connected to my CM8200 is the ethernet cable connected to my computer. Yesterday, I tested the router and made sure that it was the only device connected to the modem to try and get the internet up and running again, but I haven't had any luck with it.

[plemans]

the CM8200 can only have 1 device connected. 

power off the modem and the router, disconnect everything from both, even coax from the modem. Leave it off 3 minutes. 

Then connect the coax back to the mode, power it on. wait 3 minutes. 

then connect the router to it on port 1 and power the router on. 

Don't connect anything else to the cm8200

[JoeChillers]

After following your instructions, I tried to connect to my network, and it still gave me the same result:
No Internet, secured.

[plemans · Accepted solution]

try factory resetting both the router and the modem.