Airport Extreme no longer recognizes Ethernet port.

I have a fairly new Airport extreme, which up until a week ago was working great. For a week now it has, though the cable company and ISP have run checks on their equipment and given a clean bill of health, it will not see the cable modem or isp address. Cable works fine when ethernet cable is disconnected from airport and run direct into a computer, but nothing I can do seems to make it think that there is ethernet running to it. Any ideas what may be the cause of this? No equipment changes have been made and everything has been reset and troubleshot pretty extensively.
Thanks for any insight you might have.
b

If anyone has ideas here is a little further info.
RCA DCM425 Digital Cable Modem from Time Warner Cable. I borrowed an Airport Express version 6.3 from my office to troubleshoot with last night and was unable to get it working either. Bridge mode or DHCP neither works on either unit. Everytime I change a setting on the Extreme or Express, or check network settings it resets the cable modem. Do I need a Turnaround Ethernet cable? Should I be using a router? It does not seem to help to set as bridge and plug ethernet into LAN port instead of WAN, so not sure if a router would get past the problem.

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