Airport Extreme Cannot see Live Internet Connection from Cable Modem

Hi,
When I run a cable directly from my cable modem to my MacBook everything works fine. In fact, that is how I am connected to the Internet right now.
However, when I run the same cable into my Airport Extreme (AE) and then connect my MacBook to the AE (wired or wireless), the AE reports a problem connecting to the Internet. This is a new situation as everything has been working fine for months. I have changed nothing in this set-up for it to stop working.
I can only assume the at the AE is broken: the Internet connection is live, it was working fine for months and then stopped working. Is there anything I should try before I throw the AE in the garbage?
Thanks in advance.

Welcome to the discussions!
It appears as if you may not be aware that cable modems must be completely reset whenever the device that they are connected to changes. The reason for this is that the cable modem "remembers" the device that it has been connected to. In your case, it's "remembering" your computer and looking for it when you plug it in to the AirPort Extreme.
You need to make your modem "forget" your computer. Here's how:
o Push the reset button on the modem if there is one on your modem
o Power the modem down immediately after you push the reset button
o Pull the battery in the modem if it's easily accessible
o Leave the modem powered down at least 20-30 minutes (Some ISPs take longer)
Power down the rest of your network as well.
After the power down period, start the modem first and let it run 3-4 minutes by itself
Then start the Airport Extreme (you may need to "hard reset" the device again to start over on the configuration) and let it run a few moments
Then start your computers one at a time
Please post back on your progress. Remember, if you need to connect your computer directly to the modem again, you must reset the modem again because it will "remember" the AirPort Extreme if you have reset it correctly.

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