Currently Being ModeratedAug 15, 2012 12:38 PM (in response to CortneyWagenheim)
Sounds like the backlight has gone on the screen. You would need to replace the screen.
Depending on the model of PowerBook, will determine the cost of a new screen.
Not an easy fix on the later aluminium models, but the titanium is much easier. If you wish to fix it yourself, try ifixit websites which provides great step by step guides to fixing PowerBooks.
Best of luck
Currently Being ModeratedAug 15, 2012 9:16 PM (in response to CortneyWagenheim)
It could be that the backlight is trashed or it could something as simple as a dislodged connection to the inverter board. If the machine has ever been worked on, it is possible that the inverter board connector was not seated properly. Longshot, but it happens.
As one thing to try, do a PRAM reset while booting. Hold down the cmd-option-P-R keys at power up until you hear the second chime. (I won't go into the long discussion of why this unlikely tactic might work, but it is worth a try).
You did at least try the F2 key to see if brightness would come up, didn't you?TiBook G4 1GHz/ G5 2 GHz DP GF Ultra 6800, Mac OS X (10.4.11)