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With it unplugged, press and hold the power button a full 30 to 40 seconds. Release the power button. Then using a USB cable you know still works to charge another device, plug it into the USB port of a computer for 24 hours or until it reboots properly, whichever comes first. The computer must remain on, but can sleep.
Does the yellow charge light come on?
Unfortunately, being frozen on this screen often doesn't recover. Good luck.
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