Repair Amazon Kindle Paperwhite hard resetRestart: Restarts your Kindle. You will not lose the books, clippings, or other files stored on the device. In the event your Kindle freezes up, you can do a hard reset by pressing the Power button for 20 seconds.
Reset Device: Resets your Kindle to its original factory settings and restarts it. You should select this action only if instructed to do so by Kindle Customer Service. Before you reset your Kindle to factory defaults, you must back up any personal documents as well as older issues of periodicals that you’d like to keep. Once your Kindle restarts, you will need to register and download your items from the Cloud. If you want to passcode-protect your Kindle, you must also set up a passcode again.
If your Kindle does not power on or is unresponsive during use, you can restart it by pressing and holding the Power button for 20 seconds.