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Make sure you aren't pressing too long on the button and just shutting off the backlight. Quick press is on/off, long press is bright/dim. TO see, hold the unit under a bright light. If you can see the screen with things on it, then it isn't off, it's just dimmed.
That said, the X50 will draw some battery power to refresh the memory, so it is never fully off. As control said, if it's all the way off, it's hard reset and you've lost everything in memory.
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