I can only login to ChromeOS when the AC adapter is plugged in. If I unplug once I am logged in, ChromeOS restarts and then shows the "ChromeOS is missing or damaged" screen. I then press the power button to turn it off, plug in the AC adapter and everything works again. The screen will stay on forever even when unplugged so I do not think it is a battery problem. I will have to open it up again and check my connections.