Hello, and sorry you're having problems. We are now connected on this website- which saves you money over having a Tech come to your home, and in many cases we can fix the problem you're having. In other cases, these things do require additional parts to fix. But I can help you with that as well.
The problem you're having is often due to the software in the Kindle locking up and it needing to be rebooted. To do this, simply press and hold the power button on the Kindle for 30 full seconds, then release and wait a full minute for it to reboot.
Do not press anything else during that minute. If this does not cure the issue, oftentimes the reset procedure needs to be repeated several times for it to force a reboot.
This clears up the issues you're having 90% of the times, but in the rare case that it does not, the problem goes deeper than a software issue, and the Kindle would require repairs, or replacement. If you choose to repair the device, you can contact the folks at the link below, as they are a Kindle repair service:
Alternatively, given that a typical repair runs about $80-$100, it may be more cost effective to purchase a refurbished Kindle from Amazon (since they start at around $70). You can still download your purchased books onto the new device without having to buy them again.
Feel free to reply back if you need more help, or want to reply back with more details. It does not cost you anything more to reply back once you've rated. Please do rate me positively (at least 3 STARS) and I will continue with you until this is sorted. The positive rating ensures I am credited for my work.