HT4882 how do I put the keyboard backlight on.

Hi, I have a Macbok Pro and The keyboard backlight seems to of gone off, how do I put it back on?!
I can adjust the brightness of it, but cant put it back on.
If anyone can help that would be great.
thank you!
Kris

The backlight will not stay on all the time if the room is bright.  It will only come on in low light conditions.  If your backlight is not coming on in low light conditions, see if zapping your pram will resolve the issue.

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