My airport card on my Powermac G4 Quicksilver 2002 is not detecting any networks in os 9.2.2, 10.3 and 10.4. It works in 10.5. The card is recognized and running the hardware test says the card is ok. I've tried another card and have the same problem. I have tried taking the card out and putting it back in, reattaching the antenna, looking on the motherboard to see if there is damage. I can't get it to work. In os 9.2.2 the computer pauses every few seconds and you can't do anything briefly. If you turn off the card or disable the airport drivers it goes away. Help! Thanks!