@dixieknits: The button on the back of Nook touch is the power button. Keep it pressed long enough(3-5 secs) and turning off dialog box pops up; if your touch screen is unresponsive, keep pressing the button even after the dialog box pops up and eventually it will shut down the device.
Turning on the device is similar: keep pressing the power button, until boot up screen comes up. If you release the button at that point the device boots up; but after the boot screen comes up, if you release and immediately push the button again and keep it pressed the device will seem to be frozen at that screen. This is an "interrupted boot". You have to do it 8 times without letting the device boot up in between to initiate system restore(I could never manage it in 8 times, but more like 20-30 times).
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