We have a thread on that -
Search for a thread title with 'fastboot' in it.
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Ok. you just have a very run-down battery - -
Let it nurse on a PC port (the low charge rate curve of the Kindle) for a day or two.
Things are happening inside, even though you don't see any signs.
oh, and ignore the little light - it is under software control, and it the software isn't running (and running properly) you can't trust the light.