Router refuses to get IP from cable modem...at my wits end

Just got an AirPort Extreme and have attempted to install it. It won't pull an IP address from my cable modem, and sends my ethernet connected Mac a 10.0.1.....IP address which Mediacom tells me means the router is not talking to the modem correctly. I've tried resetting the router to factory defaults and just about every power cycle pattern one can think of between the modem, router and computer. Any ideas?
This is the third router I have owned and is by far the hardest one to get started out of the box..very frustrated as this is the exact opposite of all of my Apple experiences.

The following is how I fixed my AE basestation after a firmware upgrade and was finally able to establish internet connection to my IBM laptop after four months of AE not working (flashing amber)...at the same time I was setting up a brand new ADSL connection as I moved from Taipei to Beijing so this may help...
The solution listed is for PC Airport Utility 5.3.2 but I think similar steps will work for Macs. The important thing is to get a ethernet cable connection from basestation to computer. After that it is a lot of "button pushing"...my instructions are to the best of my recollection...
My firmware is 7.3.1
Here is what finally worked for me:
1. Power on Extreme basestation without any cables attached. Make sure your PC wireless radio is turned off (don't know if this is required but it is how I did it).
2. Connect ethernet cable from Extreme to PC---do not connect internet cable.
3. Do hard reset by pushing reset button on back of box until it quickly flashes amber and immediately release.
4. Wait ~30-45 secs
5. Open Airport Utility (or if already open, click "Rescan")
6. If AU finds your basestation but reports it isn't working, click on "Manual" (bottom left button). If AU doesn't find basestation, repeat steps 3-5...several times if necessary.
7. Open "Airport", click on "Status" and then either "Fix" or "Ignore" each error listed.
8. Save "No Internet Connection" error for last. For this one, plug in your internet cable to the basestation. You may have to reenter you ISP information.
9.Click on "Internet" and change connection from "Ethernet" to "PPOe"
10.Disconnect ethernet cable from basestation to PC
11. At this point you should have Internet and a Green LED.
12. Start your wireless radio on and hopefully you be able to surf at will.
13. One final suggestion if you find your connection is intermittent is to change the "Channel" (under "Airport" and "Summary") from "Automatic" to "Channel 1" (or other fixed channel). It fixed my intermittent connection problem...
As noted before, the above is to the best of my recollection but I have disabled updating on the Basestation now...I will never, ever, ever, change upgrade this firmware again... that is what started my problem...

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@stix180
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Message was edited by: Tim Haigh

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Router refuses to get IP from cable modem...at my wits end

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