Updated to Mavericks, backlit stopped working

After updating to Mavericks, the backlit keyboard stopped working. When i try to activate it, it shows a greyed out icon with a not available icon. I need this option to work pls. Any ideas/support?
Thanks!
Aldana

Hi there Emilylef,
You may find the troubleshooting steps in the article below helpful.
Wi-Fi base station: Understanding and resolving a blinking amber status light
http://support.apple.com/kb/TS1589
-Griff W. 

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