Try plugging it into a USB power adapter (not a computer), and letting in charge for a few hours. Then try holding the power button until the power LED goes out, then release and press power again, and remove the USB cable while it reboots.
It cannot be connected to a host PC because rebooting makes it not longer "ejected", which interferes with startup.
If that does not work, plug the USB cable into a PC and see it it shows up as a USB drive for a short time (perhaps 30 seconds to one minute) during a reboot. If it does, it can be repaired with data.tar.gz.
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