Actually that will be a good test too, try it through the Airport first. If that connects your base is probably fine. If that doesn't work connect the cable modem directly to the computer via ethernet and make sure your ethernet is active in system prefs.
You do know that when you move the ethernet cable from the router to the modem if they only give you one IP address you may have to power cycle the modem for it to hand out an IP to a new device.
I'll be taking off around 4:15 today, but will try and check back in later, what time do you think you might be able to try? I'll be around a computer so I can check in.
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