I'm just leaving this here for future people who may experience this problem, I was able to get my Kindle to boot.
Call Amazon for a replacement, especially if your in your 1 year warranty. If your past the one year, try anyway maybe they will be nice. Email customer service and say nicely that you will buy a Nook if they don't
You have 30 days to get it booted up to delete your docs before the old Kindle needs to be returned.
Leave it on charger for 24-48+ hours then unplug, hold power down for around 30 seconds, release. Screen will flash, probably return to low battery screen. Plug in and wait around 30-60 minutes or until it hopefully boots into the OS. If not, try repeating every day.
You will need to act quickly. First turn down brightness, DELETE your books/docs/etc quickly. Then Reset (Menu, Settings, Menu, Reset). Reset requires another reboot and that may never happen again, depending how drained the battery is.
This method may not even work for you but it's worth a shot, you got 30 days to try. Good luck...