In this video we take a look at how you reinstall ChromeOS onto a Google Chromebook. However, in order to complete this procedure, you will have to have created the bootable recovery media for your model of Chromebook. If you would like more information on how you create the bootable recovery media, please see this video.
Note: Reinstalling ChromeOS, is a good alternative to performing a Powerwash. This is because part of the process when reinstalling ChromeOS, will be to delete all data stored on that Chromebook. However, if you sign into the Chromebook with your Google account, your data should be restored.