Airport express: wireless works, but internet does not

Hello.
It happened yesterday for no apparent reason: Internet was not working via airport anymore, as it should have normally.
Config: Cable modem to Airport extreme (.g); USB printer attached to base station, base station Ethernet port going to router with Boradband phone and 1 PC attached to it.
4 MAc computers attached to Network (and getting Internet) via Airport.
Internet connection using DHCP, dynamic IP address provided by RoadRunner (Time Warner).
I tested Cable Modem (works), all ethernet cables (good), reset base station and recreated an airport network.
Airpot network works, USB printer is accessible via Airport, but Internet is still off (although Network Configuration in Sys Pref give me a green light and informs me that I am connected to the internet)
My question: is it possible that Base Station fails only for its Internet/WAN capability, and not for Network functions?
thanks. This one is a puzzler.
Paul

Hello.
We have been having the same problem discussed in this thread earlier, described as follows:
It happened two days ago for no apparent reason:
Internet was not working via Airport Express anymore, as it
should have normally.
Config: Cable modem to Airport Express via a US Robotics router,
2 MAC computers (iMac700 and MacMini) attached to Network (and getting
Internet), the iMac through router and the MacMini via Airport Express.
Internet connection using DHCP, dynamic IP address
provided by RoadRunner (Time Warner).
iMac connected to router is getting Internet just fine; MacMini connected to network via AEX is getting network signal but no Internet. Network diagnostics says it can't tell what's wrong and call ISP. ISP says it's an Apple problem.
I tested Cable Modem (works), all ethernet cables
(good), Airport Express network works, but Internet is still off for MacMini.
I've done a power recycling exercise twice, but still no Internet on the MacMini.
Does anyone have any ideas? Both my son and I are stumped. He's a teenager and is fairly computer savvy. Neither of us has been able to figure this out.
Joe

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