MacBook Pro 13-inc, keyboard backlight does not work

My keyboard backligth does not work.
I have a MacBook Pro 13-inch, early 2011 with MAC OS X Lion 10.7.3.
I already set the preferences to be on in autmatic mode with low ligth on but this did not work.
When I turn on the computer the keyboar lights on but as soon as the computer finish the log on the keyboard goes off.
I will appreciatte any advise.

Powerplan works great!

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