My TiBook 15" G4 (OSX 10.4.8) has an Airport slot but no Airport card. I got a Sonnet Aria Extreme card but it shows nothing on the TiBook not in the menu bar or in System Profiler. I've tried restarting with and without the card inserted. The Sonnet support guy suggested everything I had already done and then came up with "Check under the keyboard to be sure the cardbus connection was intact." Seems fine. I'm assuming the card has the Broadcom chipset because they swear it works fine on the 15" TiBook G4. Also, Airport software is updated, but doesn't show or function because it doesn't see any wireless capability. Like everybody else who gets frustrated, I've also done everything again 4-5 times, just in case the computer or the card might forget that it doesn't work. It would be great if someone could come up with a suggestion before I send it back? Thanks.