Chosen Solution

I have a PowerBook G4. Both the computer and its image are in perfect order but when I move the screen down, away from me, more than 90 degrees the image disappears. When I move it back it reappears without a problem. How can I fix this?

You need to install a new inverter cable. The cable goes from the logic board to the inverter board in your screen via the hinge, Must be cut in the hinge,