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The power button needs to be held for about a second. A quick tap on it isn't enough.
There's no reason to "thump" the touch screen, ever. It's not pressure sensitive; it detects skin contact and motion. A light touch works better than a heavy one.
Be patient; the NOOK is not a quad-core system. The touch screen also tries to ignore very brief touches in many cases, to eliminate problems caused by accidentally brushing the screen. To light up the lower screen, either touch it and hold the touch for about a half-second, or else do a double-tap on the "n". You can also press the power button for a second or so.
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