hello, i have a g4 dual 1.25 ghz with airport extreme card in it. i recently bought a powermac g5 dual 2.3ghz. i tried to swap the airport card into the g5, but when i did that, the computer did not want to scan and pick up any networks. is this because i need an extra antenna? moreover, when i put the airport card back into the g4, the computer no longer see's it. i know its firmly plugged in.... what i would like to do is have the g5 use the airport card, but help on how to get the g4 to recognize it again would also be helpful. any help would be appreciated.