You may need to force power off/on the Chromebook
Plug the charger into an outlet and the chromebook, hold the refresh key + power button down for 10-15 seconds, close your screen, wait for 30 seconds & open the screen but do not press the power button
Stop by the Chrome Depot if that doesn't work.
Test the outlet you're charging from by checking to make sure your getting an indicator light on the right side of the Chromebook
Are you plugging directly into an outlet or a power strip? Check the power strip as some have an on/off switch and/or a reset button
If you think your charger or your battery is the issue, stop by the Chrome Depot so we can test it