I'm sorry about the issue. Can you please press and hold (or slide and hold) the power on / off button / switch on your kindle device for about 45 seconds, then turn it back on and check?
Please reply at the box below to continue. Thank you.
If that does not work, if there is any cover / case on the kindle, please remove it for now. Then charge the kindle. And while the kindle is being charge, press and hold (or slide and hold) the power on / off button / switch hard on your kindle device for about 60 seconds this time, then turn it back on and check
When you are available, please type at the box below, then click on the Send button below to communicate with me, so I can help further. Thank you.