Can connect via Ethernet but not on Airport

I am able to connect fine with Ethernet. Initially when I brought up Safari it launched the modem and I had to enter my ISP username and password. Then I was able to connect fine with Ethernet. My problem is that I cannot connect with Airport. I disconnect the Ethernet from my MacBook, then I turn on Airport. It detects the wireless modem. I select it. It connects fine, but no internet. I go to the System Preferences, Network. But find nothing wrong. Am I missing something ??? Please advise.

Hi,
You also might want to check that the AirPort doesnt have it selected to have the IP set manually. Always have this detected by DHCP. There should'nt be any problems there, if you are using the Ethernet cable.
Regards
Marc

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