Mac no longer sees airport

On Monday I lost my internet connection. I use an airport extreme (4gen) connected to DSL. Connecting the DSL line directly into the iMac did not work either, then I called tech support and found out the local server for AT&T failed. After AT&T got the server back up, I was able to use the wired connect to the DSL modem, but the airport would only give me a blinking yellow light. Now the airport utility can't see the airport at all, so I can't check the settings. I have restarted everything more times than I can count. I restart in order - modem, airport - mac. All software is up to date. I didn't have any updates for the airport needed, so that didn't change.
What can be done if the airport utility can find the airport? It's six inches away.

Jonathan Lyons wrote:
What can be done if the airport utility can find the airport?
temporarily run an ethernet cable from one of the LAN ports () of the extreme to your Mac. that should enable airport utility to see the deice.

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What is the main router? Is the modem supplied by ISP? Is it a gateway device?
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