Today, my Nook Color was frozen and wouldn’t respond to taps on the screen. I pressed the Power button, but the menu to Power off never appeared. Since the Nook Color doesn’t have a removable battery, I was left confused with what to do.
The engineers who designed the Nook Color were smart. They put a force power off feature. All you have to do to force the device to shut down is press and hold the Power button on the left side of the device for about 10 seconds. Eventually the screen will go dark and turn off.
Once I performed these steps the device restarted and there were no more freezing issues.