I cant get my backlight on How do you turn it on?

I cant get my backlight on. how do you turn it on?

Do smc reset
http://support.apple.com/kb/ht3964
also
Uncheck the Automatically adjust brightness option in System Preferences / Displays. That enables manual control. Same applies to the keyboard backlight. (Although mine works with this item checked)
You may like to take a look at this Thread
https://discussions.apple.com/message/15675794#15675794

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