Problems with my AirPort card -- in dire need of help!

Hello everyone.
Something very odd and equally horrible has just happened.
I've turned on my MacBook Pro 15" and - poof! - apparently it's as if the AirPort Card (which has worked perfectly well for over a year now) were no longer there, meaning that the computer just won't "see" it.
I really am at a loss to explain this because earlier in the afternoon I used my MacBook Pro as usual and everything was fine -- I didn't do anything besides surfing the Net, as I always do. Now I've turned it on and it's as if there were no AirPort Card in the computer.
The AirPort network, on the other hand, keeps working all right (I'm writing on another Mac on the same network).
What's wrong?!?!?! Is it a hardware issue? Is my Card simply busted? Or could it be a software issue (dunno - viruses or whatever else)??
Thank you, I'm desperate!

It seems it won't be necessary -- this is beyond weird!
I've just re-turned on my Mac (which I had already tried to do a couple of times before posting my question, even allowing some time for the computer to cool off and relax, but unsuccessfully) and the AirPort Card is working again...what the bloody hel*?! Hopefully it is going to keep behaving properly for good, now!
Anyway, thank you so much for your help, I'll note down your suggestion in case it happens again in the future!
Have a nice day

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