Internet connexion after updating to OS X 10.4.6

Hi
Since I moved to OS X 10.4.6 I can't connect to internet anymore. The airport or the integrated ethernet see the network, connect to it but there no way to have the internet connexion working!!!
What's wrong with my computer?
I can connect to the router and it get its IP address automatically via DHCP. All fine but when I want to get into internet it cannot connect. It was fine before when I was using OS 10.2...
Please HELP ME!
Thanks in advance!
Ivan
powerbook G4 Mac OS X (10.4.6) same problem with my old eMac 1GHz PowerPC

Yes I tried but there is only the icon for modem connexion... Should I create a 802.1X connexion? It's very strange since it worked before with OS 10.2.8 without problem!!!
Who can help me???
Thanks in advance!

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Sorry, I have no answer to your problem. I just want to share that I amexeprience similar issues with my iMac since I upgraded to Snow leopard :
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