If you are having issues with your Chromebook, like the screen does not turn on, you can do a hard reset to try and fix the issue.
You will first want to make sure you check that the charger and outlet you have plug the charger into, is working. Then plug the Chromebook up for around an hour to charge.
The image or videos below will show you how to preform a hard reset.
Video - How to do a hard reset
Official Google Video - Fixing Chromebook Won't Charge or Turn on.