Airport Express connects internet to MacBook Pro but not PB12"

I'm using an Airport Express modem with v6.3 firmware to connect to the internet via a Comcast cable modem. It works fine on a MacBook Pro with 10.4.6 but keeps bringing up Network Diagnostics on a 12" PB also running 10.4.6. The 12" PB ends up at the 'Unable to connect to the Internet' window and says 'Network Diagnostics cannot fix the current networking problems.'
I can connect to the AE modem from the non-interneted 12" PB via the airport card with Airport Utility so I think the Airport card is OK.
Any hints as to what might be wrong?
Thanks.
Bill Whitacre
[email protected]

Try creating a new location in the network settings. Then select Network port configurations and drag Airport to the top of the list. Uncheck any unused connection types such as built-in modem and Bluetooth.

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Airport Express connects internet to MacBook Pro but not PB12"

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