Keyboard backlighting off

After upgrading the o/s to 4.5.0.81 via the Mac BB Desktop software, the keyboard backlighting no longer works. Have reloaded O/S, hard boot, soft boot, read all the suggestions on forums and nothing works for keyboard backlighting. It DID work before upgrading. No new apps installed.
PLEASE ASSIST.
Solved!
Go to Solution.

pdadams wrote:
Could it be the light for the keyboard only has burned out? This is driving me crazy!
That is where I was headed, if the KB does not light up with your hand over the LED area... it is likely (though I have never seen one burn out, it is possible).
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