The magnet in the cover puts the device to sleep when closed, wakes it when open.
Hold magnet over that area of the device, wait for it to go to sleep, turn off power, turn on and hold power switch on - - **while** the magnet is still in-place.
The above is speculation.
Based on:
Since the cover with the magnet is a "zipper close" case - -
It would normally be unusual for someone to diddle with the power switch while the case was closed.
At the moment, those are the only two known hardwired inputs (power switch and magnetic switch).
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