I have discovered I have a common fault with my Airport (wi-fi) In the apple forum other customers are experiencing the same thing. There should be an icon at the top right for the airport but mine isn't there. I couldn't get it via utilitys either. The forum posters are saying it's a wire disconnected to the card and had to send their iMacs back for replacement as there are no user servicable parts inside. So check yours before you spend 3 weeks setting it all up like me! All my software has been authenticicated to my machine now. Bummer.