I just got your second question.
If none of the previous solutions works (the most important troubleshooting steps), I have good and bad news for you (please don't shoot the messenger).
Bad news is that your Kindle is defective. I have provided you with the all troubleshooting steps for resolving this kind of issue (resetting the software, force reset, USB charging). Unfortunately there is an hardware issue on the device that software troubleshooting can't resolve.
Good news is that your Kindle is still under Amazon warranty. You have to contact Amazon warranty support service at 0800 496 1081 (or 0800 496 2449) in order to receive a new Kindle for free.
There is an option that Amazon calls you. Please follow the steps below:
1. Go to the page below - click here
Log in using your Amazon account information.
2. Select Kindle > Kindle Device (or Troubleshooting my Kindle) > Problem with my Kindle > My Kindle is damaged or Kindle is frozen/unresponsive
3. Click Phone - Call us
4. Enter your number and choice "Call me now" or "Call me for 5 minutes".
Please don't hesitate to ask if you need more information.