I followed the instructions on ifixit.com on installing RAM--followed directions exactly. Started it up again--all okay except "Airport Card not Detected." To me, a novice, the card doesn't look pushed in all the way. I tried pushing it in fairly hard and it didn't go in any further. I don't want to force it. Should the silver case be butted up against the inset frame--or should there be a thin strip of "circuitry" showing? I had to pull pretty hard to the card out--but I fear ruining the card or the slot it goes into if I really get tough with it. Or, perhaps it's not the card at all...do I have to reset something on the software or Network preferences? Is there a photo of a properly installed Airport card I could refer to? Ifixit.com's photo only shows a pair of hand doing something--not a close-up. Please hurry--I hate to see my laptop with its guts hanging out! Thanks!