My kindle is charged but the green light flicks off after 3 seconds
Hello and thank you for using JustAnswer.Your firmware may be glitched. Try resetting your Kindle by sliding and holding the power switch for 20 seconds. If you have the newest model, it has a push button. Press it and hold it for 20 seconds. Your Kindle operating system should reload within three minutes. If this does not occur or the Kindle still malfunctions, please let me know.
Still doesn't work
Let's try to force a reboot. If you have a leather cover on it, remove it. The battery charging circuits are controlled by the software as well. If the software isn't allowing the Kindle to accept a proper charge, it may cause the Kindle to malfunction too. Plug the Kindle into the charger for 10 minutes. After 10 minutes and while still plugged in, slide or press and hold the switch for one minute. Allow 3 minutes afterward for the Kindle to reboot. If this doesn't correct the problem, let me know the approximate purchase date of your Kindle.
Kindle Expert. 20 yrs repairing & 5 yrs teaching electronics