EX7300 Not connecting to computer and if connected shows no internet

[wtburk]

My nighthawk EX7300 worked fine for a few months.  Got 5G router through cable company and now I cannot get it to work.  My devices see the _2gExt but cannot get internet.  I have tried resetting everything and nothing works.  Now I cannot get it to connect to the computer.  Help, please.  i need the push on this end of the house.

Windows 10, latest firmware on extender.

[plemans]

What router did you install? 

How are you attempting setup? Using wps or the installation asssistant?