Airport problem (Powerbook G3), Please help!

Hi all, Just put a new hard disk and pram battery in my Powerbook G3 (Lombard), Fresh install of Panther, But i can't connect to the internet (airport), I am getting full signal strength and i can connect to my Powermac desktop downstairs, I am getting this message when i go to network status 'Airport has a self assigned IP address and may not be able to connect to the internet' (see pdf), I don't know what ive done!

cheers

Geoff

Uploaded pdf but it's not showing.

I had that happen in different situation. I went into System Preferences and Network and looked into all setting buttons for Airport, and deleted all, saved and closed. (You have Panther, so not sure exact locations of settings, just have to look around, as I have Tiger)