Keyboard Backlight ALS Not Present

My back light has always been working in the past but never noticed it not working until today because I haven't been using it at night anymore. It's no longer working! pressing the F8,F9, & F10 doesn't even bring up the adjustment on the display.. also, going into the keyboard preference.. I no longer see the option to enable/disable the illuminate keyboard. What is going on here? is this a 10.4.2 update bug or something? Anyone have the same issue?

Welcome to Apple Discussions.
First, rule out a software problem by creating a new user account with administrative privileges and look to see if the checkbox appears in System Preferences while you are logged in to that account. If it does, then delete the file com.apple.bezelservices.plist from yourusername/Library/Preferences in your original administrative account, then log out and back in again or restart.
If the checkbox doesn't appear in the new user account, move the file com.apple.bezelservices.plist in your Macintosh HD/Library/Preferences folder to the Desktop and log out and back in again or restart and check to see if the checkbox appears in System Preferences in your main Admin account.
If none of these things correct the problem, then it is likely that you have a hardware issue. If it is a hardware issue, it may be something relatively minor, like a loose connection between the ALS and the logic board, which is easy to fix, or it may require a logic board replacement.
Let us know how the troubleshooting goes. Good luck.
Tuttle

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