Display Brightness Slider Is Not There!?!?


I have just restarted my computer and now the screen brightness is very low - I'm struggling to see what I'm typing here!
This happened before but all I had to do was go into Displays and change the slider. Unfortuntaley it's missing this time and the F1 & F2 keys are doing nothing!
Help! I'm using a Powerbook G4 15" Titanium, Tiger OS, etc. etc.
Please respond asap! Recently no one has been answering my queries.

It's crucial that I fix this problem, I film underwater and edit on my laptop - it's my job and I need my screen!



If the F keys are not working, it's possible that you might need to press the "Fn" key in the lower left WHILE pressing the F keys for screen brightness.