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. 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! I've tried PRAM etc and nothing has changed. I've turned my computer off for a while to see if that would help - nothing. I'm running out of options, and time - I leave on assignment tomorrow evening!