Hi Tim My husband's G3 600 ibook just had the exact same problem. He thought it was probably a loose or pinched wire, and disassembled it using the guide at http://www.pbfixit.com/Guide/50.0.0.html Nothing was obviously wrong with any of the wiring - he rerouted the wires slightly differently through the hinge, and on reassembly, the display came back. The only other thing that he did was to unplug all of the connectors from the screen to the logic board, one of which was the display connector. Hope this is of some help! It's certainly interesting to hear of someone else having this problem. Helen Edmond