Hi I have a g4 1.5ghz powerbook and recently updated from 10.3.9 to 10.4.6 (I know I know, but i didnt feel like backing everything up to be re-imaged) and my airport had been acting oddly, not able to join any networks with WPA. now I find that it has gone one step further to not being present at all, my mac thinks there is no airport card installed! how can I fix this?? There doesnt seem to be any software updates except a random itunes one..Thanks.