Try this first:
After the first 6 to 8 seconds, the screen will go blank, which is normal. Continue holding the Power button.
The charge indicator light will turn on after a few seconds.Then go back into your amazon kindle account on your PC. Go to the books that you ordered and resend to your kindle.
You should not loose any of your contents that you have ordered by doing the above.
Need more help
What is the power button