IMac connects to Airport wireless network but not internet

Hi, I'm trying to set up my sister's iMac (education version) and haven't been able to get it to connect to the internet via the Airport Base Station. If it makes a difference, the ABS is an older model from about 4-5 years ago, I think. (Not extreme.)
The ABS is able to successfully dial-up and connect to her ISP.
The iMac displays the connect time, and the Internet Connect application shows for the AirPort Status that the iMac is connected to the network and that it is "Connected to the Internet via the Modem..." (followed the by the connection time.) However, the iMac still won't connect to the internet.
The wireless network seems to work okay. I'm able to access the iMac via my PowerBook and share files.
My PowerBook is able to connect to the internet wirelessly via the same active ISP dial-up connection via the ABS.
I tried duplicating the same network information from the PowerBook, but that still didn't work. As far as I can tell, the settings in the PowerBook are the same as in the iMac.
I'm tapped out of ideas right now. Any help is greatly appreciated.
Thanks!
12" iBook G3 DualUSB Mac OS X (10.4.7) Born June 2001

Finally got it to work.
In Airport Admin Utility --> Configure -->Access Control there were two Airport ID's listed there. I didn't add them, and I don't know where they came from, so I deleted them to see what would happen. After the base station restarted I connected to the ISP, and the iMac has been able to connect to the web ever since.

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