Wi-Fi on macbook will not turn on, what is the problem?

Wi-Fi at locations other than home worked fine until a couple months ago when it started working off and on.
When I would get home, it worked fine until November 07 when it quit altogether. I go into network diagnostics to turn Wi-Fi back on but there is no result.
Is this problem repairable and if so what do I need to do?
Help

Hi there marcel4help,
I would recommend taking a look at the troubleshooting steps found in the article below.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
-Griff W.

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