If your Chromebook becomes unresponsive even after rebooting (pressing Power button for several seconds) we can do a system reset. This will put your Chromebook back to the state it was when you first got it. 

Make sure you do not have any files saved locally on your Chromebook as this will delete them forever. Always save files to your Google Drive where they are safe. 

Start with your Chromebook powered on and press the esc key, the Refresh key (semi circle with an arrow on it), and the Power button, at the same time:

This should bring you to a white screen that says "Chrome OS is missing or damaged." (it's not really)

When you see that screen press and hold the "ctrl" key and then the "d" key. 

After that, it should bring up a screen saying, "To turn OS verification OFF, press ENTER". Press the "enter" key now.

This should bring up the screen saying "OS verification is OFF"

When you see that screen press and hold the "ctrl" key and then the "d" key again. 

After several seconds your screen will flicker and you should see this screen: 

Your Chromebook will eventually reboot and bring you to the Welcome screen. 

Follow the on screen prompts to reselect and reenter your wifi information. 

Once you are reconnected to your wifi, you will go through a process where you will enter your username and password twice (once for enterprise enrollment). After that the Chromebook will log you in download your settings and it will be ready for use.