It should, but have you tried getting your Airport card to work? Basic trouble shooting and things can be found at Apple's Support website. That is a basic search for airport, you might want to refine it some.
have you tried taking your airport card out and putting it back in? have you checked the arial as it is quite stiff to push all the way in. i would try all of those before you go and buy something else. maybe the airpost card is faulty in which case apple might replace it.
no i was meaning to check that the antenna plug is pushed all the way into the card.
can you tell us a bit more about your problem? does your comp not think it is there? can you see it there but will it not see any networks that are clearly there? does it just mess up your comp when it is in your comp?