Update:
It now seems clear this is a hardware problem as I only need to
reposition the display, type on the keyboard or insert a CD for the
backlight to go ff. I guess it's likely to be a cable problem of some
sort, but it doesn't seem to be a normal loose cable problem as setting
the machine to
I have a Powerbook G4 / 550 here that ocassionally suddenly turns off the
backlight after just a short time of use. Typically when I read the
display for just under a minute and then press the space bar. I can see
the makeouts of the picture, but the backlight is off. Turning the
controls doesnt
