So today I bought an Aiport Express to expand my non-Airport network, I followed some instructions that I googled, entered them all in on a MacBook Pro, and it worked! All of the computers can connect to the internet, including the farthest away one (with speed increased!). But the only problem is the MacBook Pro I set it up with does NOT connect anymore... I can connect to the wireless network, but it won't connect to the internet, and inside Safari it says that it has no internet connection. Could someone please give me some help to try to get the MacBook Pro to work? It seems as if it isn't connecting to the Airport Express because if I move it to a portion of the house the Express doesn't get to, I can connect to the internet and surf the web. Thank you of advance! Here are the instructions I followed: EDIT: As soon as I unplug the Airport Express the MacBook Pro has internet, but when I plug it back in the internet doesn't work.