The ZIF cable is located underneath the bottom RAM slot. If your PowerBook has both RAM slots occupied, make sure to remove the RAM chip.
Use your fingernails to separate the ZIF cable lock away from its socket. (Move the two brown bits down 1mm)
The ZIF cable lock will move about a millimeter away from the socket before it stops (see picture 2). Do not try to remove the ZIF cable lock.
Remove the four 3.4 mm Phillips screws from the DVI connector side of the PowerBook.
When replacing these screws, you must reinstall each screw in the correct order. Begin by installing the screw closest to the display hinge, and go out from there.
During reassembly, make sure to reinstall the two screws on the right into their appropriate locations, and not the DVI port anchor holes.