I have recently upgraded my wireless network to N+ using a Belkin Modem Router. Security is WPA2-PSK, and MAC access is disabled. All MacBooks (Leopard & Tiger), PCs (XP) and iphones connect without any problem, however my daughter's PowerBook G4 running OS X 10.4.11, and with the most recent Airport software, can't connect to the network. The password prompt when selecting the network only allows for entering a WEP password. Any suggestions gratefully received by a Dad who would do anything for his daughter save shell out for a new MacBook!!