It sounds like the Chrome Operating System has been corrupted. You can restore the operating system by creating a recovery image. This guide here should give you the first few steps for creating one. When you get to the Identify Your Chromebook screen, you will want to select your manufacturer and model of Chromebook.
Once you have the recovery image ready push the Esc+Refresh on the keyboard, then press the Power button to reboot in recovery mode. Your device should prompt you to plug in your recovery image.
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