I know this is not happening to everyone, but it certainly is to some. After upgrading to 10.4.6, the backlit keyboard on my powerbook will no longer light up! If I press the F8, F9, or F10 keys, it just shows the translucent black box with a no-go symbol. (see below for screenshot) I'm on a 15" powerbook G4, 1.5ghz. turning on and off the backlight via system preferences does nothing. The screen still dims when the ambient light decreases, but no love for the keyboard. Anyone else have this happening to them? Or not happening to them with the same machine?