Macbook Pro won't connect to internet. Yet says it is connecte to wifi.

So I can't seem to acess my wifi on my new macbook pro even though I can acess it on my PowerBook G4.
At first it said it wouldn't connect/ couldnt find IP adress, so I entered the IP information from my G4 and it said it was connected but still could not veiw web pages. I tried renewing the DHCP lease several times but still could not get a Router #. I also tried using Keychain first aid.

Speak to the person who runs the internet connection for your school. they may need to accept you ip address into the system

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