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Rememebr one thing that can make diagnosing problems with eInk devices is that the screen does not need power to retain an image.
Many times we've seen people who thought their unit was dead discover that the real issue was a totally discharged battery. With a dead battery, no combination of buttons, power switch, reset pin-hole will change the display.
So any time you think it's dead, try leaving it plugged in to either a wall based USB charger or a PC / MAC for a few hours.
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