Last week, my airport connection suddenly stopped working (and I mean JUST as I was working on it, it started failing). It would connect to the network fine, but it could not communicate with the router through DHCP and even with a static IP, it could not transfer any network data. I put in my brother's working airport card, and it worked, so I ordered a refurbished airport card from ifixit.com. I put that in today, and it is showing the same symptoms of my old card. I don't have my brother's PowerBook to test his card again, so I don't know what to do. Does anyone have any ideas?