Hello! Thank you for your question. I will be assisting you today.I'm sorry about the issue. What's the model of your computer, such as paperwhite, fire, etc.?How did you download the books on the kindle?Can you go to the Wi-Fi / wireless option on the Kindle, then let me know what you see there?When you are available, please reply back at the box below to continue. Thank you,
Sorry, do you need to keep anything from the tablet? You can download the Dropbox app to back up / store you data.
By the way, you did restart the tablet right (press & hold power on/off button, then select restart option.)
Please reply at the box below. Thank you.