No wi if hardware is installed on MacBook Pro?

I see wifi logo that has an X on it by saying "no wi-fi hardware is installed after Genius Bar took tests on my MacBook Pro and it said passed. So, again I have the same problem. Does that mean it has to replace new airport card?

1. Reset PRAM.  http://support.apple.com/kb/PH14222
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
Best.

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