I've tried holding down the power button, but it's completely unresponsive. The only thing indicating that there's any sort of charge is the LED at the top, but it still shows that it's charging, even when removed from the dock. I also tried plugging in the USB directly, but was faced with the same problem.
We want you to be able to power your device back up. Have you tried holding down the power button and the volume down key at the same time? Let us know if this helps.
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