You need an original apple airport card, which will plug into the slot inside the machine. The cheaper option is to find a third party USB or PCI card( there are lots out there that are compatible, "Google") this will make it possible to bump up to G or Pre N speeds as the airport card is only "B" speed. AFAIK, you cannot use the Airport Extreme card. BG On Jun 25, 2009, at 8:52 PM, Richard Quinn wrote: > How can I upgrade my G4 400 Yikes to have wireless capability? > > Rich > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4