Sometimes, the Kindle Fire gets stuck on the boot screen animation logo, there are various reasons why it would freeze like that, if your Kindle Fire is still vanilla (e.g. you haven't rooted it), it probably just needs a hard reset.
How to hard reset a Kindle Fire?
How to hard reset a Kindle Fire?
- Press and hold the power button for around 20 seconds and release.
- When it turns off, turn your Kindle Fire on by pressing the power button.
- That's it, your KF is running again!