HT3964 On my macbook pro my keyboard backlight won't work but it use to. I think i pressed something in the settings? please help me!

The backlight on my macbook pro isnt working but it use to work before by using the F5 and F6 keys. I think i pressed something in the settings to change this. please help me!

If you are in a well lit area this will pop up on the screen. 

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