MacBook Pro up arrow key does not work how to fix it?

When I am just working on the computer the up arrow key does not work at all but when I use bootcamp to go to the PC side the arrow works so i know its not a phisical problem, i have tryed everything i know and still no success.

Hello brooklinekilla,
I would be concerned too the up arrow key on my keyboard was not working. I found an article that can assist with further isolating and troubleshooting issues with the built in keyboard. I recommend following the steps under the section titled, "Some keys don't work as expected" in the following article:
One or more keys on the keyboard do not respond
http://support.apple.com/kb/ts1381
Thank you for posting in the Apple Support Communities.
Best,
Sheila M.

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MacBook Pro up arrow key does not work how to fix it?

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