Pixma MG7720 set up app won't open on iMac

[toltrider]

I was able to use this printer wirelessly for quite a while but I no longer can. I uninstalled the printer and software. I turned off and unplugged printer, restarted my Netgear 98 modem. 

I downloaded and installed the software and drivers for this printer from Canon site. I restarted iMac, currently running Mohave 10.14.6. Plugged in printer, turned it on. IMac could not find it so I connected it with the cable so I could add it. 

Of interest, when I try to open CanonIJ start up app, the app immediately closes without doing anything.  IS this the source of my problem? What can I do to run it? 

Is there an additional issue that won't allow a wireless connection? What can I do to fix?  Am so frustrated with this that I am thinking of smashing the printer to bits and buy an Epson! Thanks for any help.

[Patrick]

Hi toltrider,

Please try using the WPS PIN Code method to connect your PIXMA MG7720:

https://support.usa.canon.com/kb/index?page=content&id=ART173537

If you continue to have difficulties, please contact our support group using the following link:

http://Canon.us/ContactLI

[toltrider]

None of your suggestions worked. What now?  Network Config printout shows connection as "Inactive", I found an IPv4 address when I did something, but can't remember what I did. I manually entered it.  The page that comes

after selecting  IPv4 has IP Address, DNS server and Proxy Server.

What goes in DNS and Proxy Server fields?

Is this problem with the printer, router or computer? 

[toltrider]

Will call Canon. Let's hope someone answers as I have read that no one does answer.