Why does my airport extreme not recognize my cable modem anymore?

Why does my airport extreme not recognize my cable modem anymore?

Have you tried resetting the modem? Power it down and let it rest a moment, then power it back up again.
Also, some ISPs require physically detaching their cable from the modem for it to be fully reset. Literally unscrew it from the modem. Try that, in conjunction with powering it down.
Don't do anything with your Extreme, other than powering it down too, in the event the modem reset does not help. Reconfiguring it may be necessary but this is not justified quite yet.

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