Why does my keyboard lights don't come on my apple macbook pro

why does my keyboard lights does not come on my macbook pro?

acidking wrote:
Try to reset your PRAM: http://support.apple.com/kb/ht1379
Actually, if the setting is correct in Sys Prefs, and it's dark enough, and the lights still don't work, try an SMC Reset (not a PRAM Reset): http://support.apple.com/kb/HT3964.

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    Please read "Additional Information".
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