My macbook pro wifi stop working suddenly, and know appears a X on the wifi icon, what may have happened?

Hello,
My macbook pro wifi stop working suddenly, and know appears a X on the wifi icon, what may have happened?
Its seems to be the harware.

Hello raphaelitajuba,
The article linked below provides information regarding this indicator and steps that can help restore functionality to your MacBook Pro's Wi-Fi.
AirPort has detected a problem with the driver or a necessary sub-system component, apply the latest manual AirPort software update or reinstall Mac OS X. If reinstalling Mac OS X does not correct the problem, take your computer to an authorized Apple service center.
The AirPort status menu (AirPort Menu Extra) FAQ
http://support.apple.com/kb/HT3821
Cheers,
Allen

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My macbook pro wifi stop working suddenly, and know appears a X on the wifi icon, what may have happened?

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