I'm having trouble with my airport.. I go to a University and use their wireless internet on my macbook pro, so I don't have access to the port or base or whatever. It's only my mac, nobody else seems to be having the problem. Also, I get a strong signal, but I can't go to web pages or anything. When I try, I get the "you are not connected to the internet" message. When I go to network in system preferences, it says "AirPort does not have an IP address and cannot connect to the internet." The internet works fine when I use an ethernet cord. I've tried rebooting the computer, turning airport on and off, using Network Diagnostics, placing my airport first (before ethernet) in the network lineup, and removing all my preferred networks and just keeping the one that I use most often. I have no idea if any of this should have helped or not, but it didn't. What can I do?