My mac keyboard lights are not working

hi..
i m using mac pro 13... suddenly lights of my the keyboard is went off...i restart the machine by nothing happen.. the problem is still same only..plz help me out...
thanks,
jatin

What do you have in System Preferences, Keyboard under "Adjust keyboard brightness..."?
What happens when you push F6 to increase the keyboard light intensity?
Normally, if you have that checked, the keyboard lights only come on if the ambient light level is sufficiently low.  They go out when the light level gets high enough.  (Sorry if I am stating the obvious.)  The sensor is at the top of the display, where the camera is.  If you cover the camera lens, do the lights come on?  (You may have to turn up the light intensity with F6.)
Try unchecking that preference box.
If nothing else works, try resetting the NVRAM.
If that doesn't work, you probably will have to take your machine in for servicing.

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