I searched for the same issue, but couldn't find anything: I have a Macbook Pro, 15.4", I bought it in March of '07 and I run Leopard. My girlfriend has a 13" Macbook, purchased in June or July of '07, also running Leopard. My issue has to do with the wireless card in my Macbook Pro, as there are several occasions in which I could be sitting next to her on a couch and she can connect to a wireless network, but I can not. Do both 'books have two different "builds" of the wireless card internally? It doesn't make sense to me (as a PC technician myself) that one notebook can connect, and the other can not. No settings have been modified inside of network prefs, which was the first thing I thought of. I just didn't know if there was a "known issue" with the cards on a Macbook, and if I need to take it in to my local Mac repair guy? Any help/enlightenment is greatly appreciated!