My screen also suddenly went dead. I was reading one evening. The Cybook was in its case. I switched it off and placed it on the table. The next evening I opened the case and switched it on. I had a few normal screens during the boot process an suddenly only the the lower left part was working. It was exactly 1/4 of the screen. This must be a flaw in the design or a bad batch of screens. It is almost impossible to break anything in exactly 4 equal parts by accident.
Mine was from the very first batch
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