Can't setup Airport's wifi or ethernet

With the help of the Community here, I was able to fumble my way through multiple-user Airport network with succes. But now, I'm having problems with a simple Airport setup. The Airport Utility comes up this display on my iMac: *******
The Internet light is green because I'm using a wifi host. Otherwise, the Internet light would be gray; moreover, a status light says I have a problem with my Internet Connection.
When I click on the amber status light related to Internet Connection, I get a repeated request to recycle my modem:
...but resetting the modem doesn't fix the problem - in other words, there seems to be a problem with my network setup. To verify this, I went to System Preferences/Network, which comes up with an amber light. When I try to access the internet, there's no connection.
I've reset the Airport a half dozen times, but get this hangup every time. How can I fix this?
<S/N Image Edited By Host>
Thanks!

It got to be frustrating, so I reset my Airport, and then switched the Airport input/output - and it worked. Apparently, while setting up a pair of Airports for a small array of devices (two Airports, a MacBook Air, Macbook Pro, iPad), I forgot how to set up my original home Airport (which has one Airport, a MacBook Pro, iMac, and iPad).
I'm never going to move the cables again.

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