I have a a dilemma on my hands. I try to install an airport card on my 17 inch flat-panel iMac and it appears that I do...but looks can be deseaving! I exchanged the airport extreme cards at best buy thinking there was a problem with the card...When I "install" the card my computers fans won't spin more than a second before dying out...and other times it seems my computer does turn on but the screen doesn't light up...Can any one PLEASE give me some advice...I think my airport-port in my iMac is defective... but where would i go about replacing this if thats the case.... and how much do you assume it would cost? If my port theory isn't what you have in mind please address it... Please help! I'd love to have my new Powerbook and imac networked ASAP!!! Thanks