How can I troubleshoot - extreme 802.11ac does not connect to Xfinity Arris WBM750 modem?

Installed airport extremem per instructions and all went well - I got a solid green light.  My modem has five green lights - one flasing which is how it always looked with the old router.  My network preferences show that I have a working internet connection.  I have not set up a WiFI network yet.  I think I should be able to connect to the internet with a wired computer, but I can't.  The airport utility shows a green air port with a yellow internet connection.  However, my modem is solid green.  I have rebooted everything twice, and I know the cable is good because it works fine with the old modem.

Just a bit more detail.
What mode is the AE setup for, bridge or dhcp+nat? Shoud be the later.
I have rebooted everything twice, and I know the cable is good because it works fine with the old modem.
What old modem is that? Do you mean router?
One simple thing if the modem is cable.. pure modem.. (edit.. just checked the model and it is), you need to shut off for 20min at least when you change routers? It takes that long for the ISP equipment to forget the MAC address of the device that it was allocated to. Sometimes it can be longer.. or you might even need to ring the ISP and ask them to reset the connection at their end.
The new AC model does also occasionally have cabling issues.. it is nothing to do with the actual patch cable it is the ethernet ports are not compatible in some way.. but tell us how the above works before we get into too much details.

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