This is driving me nuts. Got my new macbook pro 17 unibody and love it. Turn it on, set it up to access my wireless and all is hunky dory for a few days. One day, it goes to sleep, comes back out of sleep and refuses to connect to my network. Says has self assigned IP. So I do all I can think of, check all the other macs are working with the Airport Extreme base station and they are, reset it anyway, and still no luck. Try connecting to another wireless network a neighbour has and it works fine. Try to connect to mine, either won't connect at all or self assigned IP. Try again with old macbook pro next to me and it connects fine. Then a day later, it randomly works for a few hours. Now it doesn't again even though everything else does. I'm tearing my hairout, I can't come up with any reason why this is happening when the router is fine and allows the other Macs to connect and the new Mac will connect to other wireless networks but not the one here. Please, someone tell me they have a solution!