HELP! Airport WAN not working

Hello all,
First, let me explain my setup which has worked for over a year now:
Cable Modem--->AEBS (WAN port)--->Transmits to 2 G4's and a Powerbook
Two days ago, I turned on my machine only to discover that my internet was down. I first tried calling my cable company, but after a little discusssion, we discovered that the modem was working fine, and the internet works when I connect directly from the modem to my machine.
Upon disovering that the airport was the problem, I tried many things, from changing wires and soft resets to restoring factory settings. I updated the firmware and software.
When I went into Airport Admin Utility, it gave me the following message:
Internet Connection Warning
There doesn't seem to be anything connected to the AirPort Base Station WAN connector. If you are using a DSL, cable, or other broadband modem to connect to the Internet, or you are using a network that is connected to the Internet, plug the modem or network into the WAN connector.
So...I'm very confused. I've tried everything I could think of. Any help is greatly appreciated.
Steve
G4   Mac OS X (10.4.7)   AirPort Extreme Base Station

Since the typical Linksys wireless router is down to well under $50 (up here with rebates I bought one for $30 CDN), you may be better off just buying a non-Apple router which work very well on Apple networks. The AEBS are quite costly for what they do vis-a-vis the marketplace for these devices.
I have one set up as a WAP off a wired router and it works great. They work almost instantly out of the box, support WPA-PSK (as does your Apple) and frankly unless you have checked all settings on the AEBS, for DHCP, etc., and if you have, without results, this might be the simplest and certainly the easiest cure.
Note always try a new cable between the cable modem and the AEBS before giving up. Also note the setup software doesn't work on Apples for the Linksys but the settings are 5 minutes work to enter. If you keep the same key (PSK) as the AEBS and the same SSID/channel I doubt you'd have to reset the client computers as well.

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