I have an iBook OSX 10.4.2 with an airport card. I use to be able to connect to the internet thru my Airport extreme or my Linksys wifi router. After installing an update from Apple(I dont know for sure but I believe it was the 10.4.2 update), I can still see the wifi routers but I cannot connect to the internet anymore. I have tried my PC Laptop and it can connect to the internet successfully to both Airport and Linksys routers. I tried turrning off the airport on my ibook and turning it on again but it made no difference. I really appreciate any advice.