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If you've had the marching squares for a while, the battery may have started full, but now be empty or nearing empty.
Charge it fully.
Pinhole reset.
If nothing happens, try turning it off with a long power-button hold (regardless of what you see on the screen), then hold the paperclip in the reset hole while turning the reader on. Wait. If nothing happens, repeat.
What were you doing with the reader just before this happened? Could it have had the cable pulled out without being ejected properly from the computer, or could it have been updating itself by wifi?
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