Hello and thank you for using JustAnswer.
Most likely this is attributed to a hardware failure.
We can rule out the software by rebooting it.
Most likely you have glitched software. Reboot the Kindle by sliding and holding the power switch for 20 seconds. The Kindle should come back online within 3 minutes or so. If this doesn't correct the problem, let me know. If it does correct it, please remember to accept my answer so JustAnswer credits me with assisting you today.
Any reaction at all?
I believe you may have a problem with the chat feature. I'll switch to question and answer mode and we will continue from there.