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As a last resort and with little hope of success I suggested we see if we could disassemble the screen. This often means complete disassembly of the laptop in order to remove the screen, but with the removal of 2 screws in the screen bezel and releasing the clips around the edge with a spudger, the bezel came off. Four more screws and we could very carefully angle the LCD forward out of the lid. Very careful examination showed that the video cable at the LCD end was unseated by the tiniest amount at one end even though secured by sticky tape. So we reseated it, reassembled the laptop, and to the owner's huge delight the screen immediately sprang to life!