No airport card installed

I'm having problems with the airport extreme card in my G4Powerbook. Everytime I click on the icon for wireless internet, in the pulldown menu I see the message: "No airport card installed" someone please help me out here. I need wireless pretty badly. Can someone also tell me where the airport card is located in this? thanks..

try to reseat ur card... I was having this problem a while back when it woke up from sleep..i rebooted it... no luck then took out the card and put it back and it was going string.