Display brightness control lost

Dear fellow MAC users!
I'm using my 1GHz PowerBook G4 for almost three years now an I never had any problems with the display or ALS, neither under Jaguar, nor under Panther, nor under Tiger.
However, since yesterday I'm not able to change the brightness of my display. The keys "F1" and "F2" simply don't work (and the ALS seems to be turned off, as the keys "F8", "F9" and "F10" don't work either).
At first, yesterday my display was dimmed. After resetting the PMU (Shift-Control-Option-Power) and resetting PRAM and NVRAM (Command-Option-P-R) my display is working at the brightest setting now.
But when I open System preferences/displays then the option to adjust the screen brightness and the box to check whether the screen shall adjust automatically simply are NOT THERE.
I hope strongly that anyone out there has a solution for tnis problem! Are therer any experiences with this issue? Do I simpy have to reinstall Tiger?
Thanks for any suggestions!!
Regards,
Matthias
17" PowerBook G4 1GHz   Mac OS X (10.4.7)  

I simply re-installed Tiger.
I have to say . . . and obviously I am speaking only for myself . . . since this happens infrequently and is solved by a restart, the payback timewise is about seventeen years.
I'm disappointed that there's no attention to this one by Apple. The "gee, I have a problem, I need to reboot" or "Gee, I need to re-install the OS" is a distinctly Microsoft mentality, and one of the reasons I switched to Apple. It is exactly this kind of little insignificant irritation, multiplied by 50 or so, that makes the difference between the pleasure of using an Apple and the pain of using a Microsoft system. OK, so we've got 49 to go. But I do hope that Apple doesn't slip into the mentality of "Oh, it's just a tiny problem, not worth working on." It's the little things that make the difference.
PowerBook G4   Mac OS X (10.4.4)  

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