IMac won't connect to internet, but can on internal network

Hi,
I've tried resetting the router and various other things that I found on the internet.  I know its not a router problem as I am using my MBP to post this discussion.  It won't even connect to the router's internap page.  Any thoughts?

With the iMac failing to open any web page outside of your network, then I would be checking the DNS setting in System Preferences > Network > Wifi > Advanced. Compare what you have here to what the MBP has set.
But with the iMac also failing to connect to the routers internal web page then you've got additional problems beyond DNS. Using the MBP as a reference, if you make a note of the TCP/IP network settings in the Advanced section as shown above, is the iMac using the same? (apart from the IP address which should have the last number set to a different value).

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