Keyboard no longer lights on Macbook Pro

It was working fine, but now it just doesn't light at all. I checked System Preferences but there was nothing for keyboard lights. Is this a sign of a bigger issue?

   Backup your computer.
    Reinstall OS X Yosemite.
    http://support.apple.com/kb/PH18872?viewlocale=en_US&locale=en_US
    Best.

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Dharma

Your message would be easier to decode if you had proofread it before posting.
Does your keyboard work when the mouse is plugged directly into the computer instead of into the keyboard, or does the keyboard not work at all? If not at all, then it sounds as though you're right in guessing that the keyboard isn't getting power for some reason (bad cable? bad connection inside the KB? USB port on computer shut down?) If the KB works when the mouse isn't plugged into it, then the mouse and KB together are demanding more power than the computer's USB port can supply, and neither is getting what it needs when the mouse is connected to the KB. In that case, plug the mouse directly into the computer to use it.
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Thanks! That was easy.
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how long can a macbook pro battery last?

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Hi BobRz, you are probably talking about the screen display which normaly dims during low light conditions, and that's true. but my concern is the keyboard brightness, it suppose to increase in low light conditions, but instead it dims to the point that i can no longer see the letters on the keyboard. I have viewed a youtube video about the normal adustment function, and mine is doing the opposite

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I understand there isn't just a breakdown date or timer, but I am just asking for a guess from the community! Sorry for the confusion if there was any.
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Miller for Christine

Oh dear. No replies seems to imply this is a thing that can't be fixed at all.

Keyboard no longer lights on Macbook Pro

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