Hello fellow Mac users: Recently, my mother bought a 14" iBook G4 1GHz off Trademe (like eBay for you Americans). When it arrived it had a clean installation of Tiger (I can't remember what point release) and the Airport worked fine. I upgraded to Leopard by doing an erase and install and the Airport would no longer find any networks. So i downgraded it to Tiger again, updated using the combo update, and the Airport still won't work! What seems to be the issue? How can I fix it?