Airport extreme no internet, though light is green

Hi,
My Airport Extreme won't connect to the internet anymore. It's light is green (no blinking or anything). It worked for years, but now it doensn't anymore.
My modem is working fine. I checked that, by directly connecting my iMac (by an ethernet cable) to the modem, and then there is a working connection to internet. So I concluded the Airport Extreme must be the problem. I even replaced the Airport Extreme by an (El-Cheapo) other wireless router, which worked like a charm. So the problem is indeed the Airport Extreme.
This is what I tried (many times and in various ways/order):
1. Rebooting the modem
2. Rebooting the Airport Extreme
3. Factury reset of Airport Extreme and setting it up from scratch
4. Disconnect all Ethernet cables to the Airport Extreme, except for the WANand mto my iMac
5. Disable Wireless modes
6. Downgrade firmware (and after this do not resolve the issue), upgrade to the latest firmware again
but none of it resolved the problem..
Suggestions what to try next??
Alte.

Finally I solved the problem myself by a full power cycle of the modem and the Airport Extreme, as described on
https://discussions.apple.com/docs/DOC-3412
Only when following exactly the steps (in the order) as is described, I was able to get an internet connection (again). Before, whenever I lost connection, I just rebooted both the modem + Aripiort Extreme (i.e. unplug-wait-plug the power), and I would be reconnected. So still, now, I feel AirPort Extreme is starting to fail... Let's see for how long it will be running now...
Thx for the help/reply anyway!!

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    Now your Timewarner WiFi modem is turned into a dumb modem (bridge mode) and your AEBS will work like a charm. 
    6. Factory reset you AEBS and go through the setup. 
    It only took me 3 weeks to figure this out by trying any possible combination of settings and resetings and reconfiguration you can imagin. I have recreated this issue and resolved it following these steps and it worked for me. I hope it works for anyone else that may be facing the same challenge.
    Cheers

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