My macbook wi-fi has stopped working altogether. What can I do to remedy this?

My Macbook wi-fi has stopped working completly. It was not a matter of the wi-fi being off and on but rather when it failed, it failed and never worked again.
Has anyone experienced this happening and what are the remeddies to the problem?

You should check if this is a hardware problem. In OS 10.9.2 you can do this:
Apple menu / About This Mac / More Info / Overview / System Report.
(note the details of this path are different in other versions of Mac OS X.)
Under Network in the left column, select Wi-fi. If your hardware has failed, the right side will say something to the effect of no device detected.
If the hardware has failed you will have to open the Macbook and replace the card - assuming your MB model allows that. If the hardware is detected, there are steps you can try, but they depend on details about your computer that you have not provided.
If you follow up with another post, please tell us what version of Mac OS X you are running, and the Model Identifier of the Macbook.

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