AirPort won't connect to the internet
 

What the hell is wrong with my Apple stuff?
AirPort keeps setting it's own IP address for me, and it's always wrong, so it doesn't connect to the Internet. My built in ethernet is smart and acutally gets my IP right. When I manually enter it into the AirPort configuration, it still wont connect. It's driving me freaking crazy, because my mom is b*tching that she wants to check her mail, and I can't even get the network to connect to the Internet.

PLEASE help me, Comcast wont.