I'm using a Macbook Pro with OSX 10.5.8, and all of a sudden it refuses to connect to the internet upon start up. Open Firefox--- and nothing. The Airport says it's connected, and I know the internet is working (my dad's able to get on, as is my friend). The Airport says it's connected to the correct network, too, and hasn't "forgotten" the WEP key--- so it should be working, except it isn't. It's done this a few times, but after refreshing the internet for about a half hour, it would fix itself, so I let it continue longer than I should have. I've tried shutting the computer down and restarting, shutting the modem down and restarting (while simultaneously restarting the Mac). Nothing. And I even tried plugging the computer in to the router with an ethernet cable, and it STILL says it can't connect. I have tried repairing disk permissions, as well but this also did nothing. I am very frustrated and would really appreciate some help ASAP. Thank you.