Just got a G5 last week... I received my airport extreme card today in the mail, i got it in the comp fine and the comp is recognizing it, but i can't get it to find my router. I plugged in the antenna wire that runs to the back of the comp but i don't have a external antenna plugged into the back of the tower. is this my problem? i thought i would atleast get a weak signal with no external antenna since the router is only in the next room.