Chromebook Won't Start and/or Charge
A Chromebook that is not powering on or charging may require a hard reset.
This is a simple procedure that can be done in about a minute.
With Chromebook plugged into the AC adapter
- Turn off your Chromebook. (Press and hold the power button until the power button light turns off.)
- Press and hold Refresh + Power for 30 seconds
- When your Chromebook starts up, release Refresh .
The refresh key is located over the 4 key on most Chromebooks
If that does not resolve the issue, remove the AC adapter, and try again, lastly attaching the AC adapter and trying a final time, close the lid and re-open
Original article https://support.google.com/chromebook/answer/3227606?hl=en