I recently installed a Linksys WRT54G2 wireless router (replacing older SMC wireless). I have a MBP that connects fine with WPA Personal. Our iBook (10.4.11) using an 'original' Airport card will connect with WEP or without wireless security, but will not connect with WPA. WPA is available in the Airport Connection dialog, but when I type in the password, I get the error message that it failed to connect.
Doug
Yes, hopefully you just have the router set to WPA2 and can just switch it to WPA and that will solve your problem. Just a warning, if you do the update, you might mess up your card completely like I did it. Just search my posts and you'll see what I mean.