Keyboard backlight not working...

Hi everyone!
I am having a problem that appears to be shared by other Powerbook users who have the luxury of a backlight for their keyboard: I have updated OSX and now the option of automatic illumination has gone from the Keyboard and Mouse preferences window?
Does anyone know how this can be fixed? I have only had my laptop for 13 months and so far my hard drive has died and the system has crashed completely three times, I would be devistated if this is the logic board now? If you think it is please lie!? Only joking of course, but if anyone has a neat solution I would love to know!
I have already tried to set-up a new user, and have removed the com.applebezelservices.plist from the library, but no joy so far.
I use this luxury lots, since I work at night. Any help would bring festive cheer to me and my children to be!!!
Regards,
Simon

Same problem here with my powerbook 15" 1.5ghz.
It seems that this problem is common with a lot of people as I can see from the forums that I went on.
The ambient light sensor seems defective since a software update (probably the 10.4.7). Results are that the auto-dim of the screen does not work all the time, the keyboard no longer backlight up in dark condition and the sleeping status light blinks for no reason or it stays on when computer is open.
I've tried to zap de PRAM and reset PMU with no results.
I've read that some people has a loose connection between logic board ans ambient light sensor... could that be the reason as you mention taht they told you so?
I've read that some people with the same problem had their Logic Board changed as they were under warranty... but for the rest of us that are not on the warranty anymore... no answers from Apple. I think that they should open a repair ticket and that everybody who has this problem should contact Apple

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