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Battery was left discharged too long.
Leave it on a wall charger for a few days, up to as long as two weeks, until you can access the USB storage.
(You might try that once every other day while waiting for it to 'fix' itself.)
Then put at the top of visible USB storage the file named:
DO_FACTORY_RESTORE
No extension, no contents, all capitals.
Remove USB cable and re-boot the Kindle.
If it is slow to come back up (depends on what all it has to fix), put it back on the wall charger and wait some more (measured in days if required).
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