Let me start by saying that I know very little about how computers/networks, etc work. I've had my macbook for a couple years (I don't even know how to find out what year it was made, I'd guess 2008). It just suddenly stopped allowing me to connect to the internet wirelessly at my house. I brought it to my college campus, where I've been able to connect all semester, and I cannot connect there either. I'm receiving wireless signals in both places with my phone. When I go to system pref - network....and highlight airport, it says it's not connected even though i have all my bars at the top right of the screen. It says "Airport does not have an IP address and cannot connect to the Internet." I should point out that my brother's macbook pro still works fine wirelessly in our house. Please help. Thank you.