Hi,

Please press and hold both the Power button and the Home button together on the iPad for at least 10 seconds, until the Apple logo appears, then wait a bit, then check.

If that does not work:

1. Tap the Kindle icon on your iPad, iPhone or iPod touch.
2. Tap the Settings icon in the lower right-hand corner of the screen.
3. Tap "Update" under the Registration field and then tap the Deregister button.
4. Then re-register.
5. Then log in your amazon account at the website http://www.amazon.com/manageyourkindle and then click on the Action tab of each book you want, then deliver to your iPad device.
   

Please let me know if there is still any issue. Thank you.

If you would like any additional information or have more questions please don’t hesitate to ask!

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Thank you,