I recently installed a new Airport Extreme base station at home and installed the old one to our place in the country where we have 2 identical G4 iMacs running OSX 10.4.11 in our house. I bought 2 Mac USB wireless cards from Rokland (excellent) and plugged them in to both machines. Machine 1 is working perfectly using either of the USB sticks (I'm typing this message on it!) but Machine 2 (5 metres away upstairs) indicates a signal strength of 92% and 91% for link quality but then gives me 'You are not connected to the internet". Clicking on System Prefs>Network gives me "Ethernet Adaptor (en2) has a self-assigned IP address and may not be able to connect to the internet". I have several exchanged of email with the helpful guys at Rokland but no result. I take the Machine to the local Mac Shop and they have no trouble logging in and connecting to the internet. The technician is stumped. Any ideas please? PS I am a mac user since 1980 but a complete novice when it comes to understanding what's going on inside the machine.