I have a 24" Imac That I purchase in Sep 2008 and I want to turn on the airport so my older Dell Laptop can use the internet connection in my apartment. Am I asking too much or should it be able to do it?
In the Sharing preference pane, go to the Internet tab, then choose Built-in Ethernet in the 'from' dropdown and tick the box for your AirPort card in the to list. Hit 'start', and you have internet sharing!