New cable modem, airport has green status, still NO internet connection??

Airport extreme worked amazing with macbook for 8 months! One day my cable modem was no longer working. Had internet provider come and install a new modem.
The new modem now works, and cable provider assured internet worked through a direct ethernet connection to macbook. However when I reset up the airport I can not access internet.
All modem lights are working properly and airport has green light. I am linked to my network.
I have troubleshooted with applecare 3 times with no success. They sent me to the mac store, the store checked both my macbook and airport. Said they are working properly.
Came home and did all the resets of both modem and airport. No success! Applecare says everything matches up, internet provider says everything matches up. But I can still not access internet with airport.
Message was edited by: jmorosoff

Your cable modem needs a complete reset to clear its memory.
Power it down for at least 30 minutes (Some ISPs will take longer for their equipment to reset) and pull the battery in it if it is easily accessible. Power down everything else in your network as well.
Start the modem first and let it run 4-5 minutes alone, then start the router for a few minutes and then start your computers.
If no luck, power down the modem for 2 hours and try the procedure again.
Please post back on your results.

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http://discussions.apple.com/thread.jspa?threadID=2316
78&tstart=0
I think if you follow the instructions I gave in this
link you will be fine.
Remember, If you for any reason loose your
connection, it is normally always a Power Issue..Your
ISP is down for service ..or some other anomoly, If
you were good before your settings will still be
good...Good Luck...Don
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