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The owner had already done a good job of disassembly and reassembly to look for faults, including reseating the video cable connector on the motherboard, but without success. We repeated that, and I couldn't see anything visibly wrong either. It looked like it was either a faulty screen (a new screen might have fixed it) or a faulty video driver (which would mean a new motherboard) but it was impossible to tell which. The owner was ready to give up and dispose of it.