Answer to: Why is my Nook HD not turning on?My mom has a Nook HD. The light would go from green to amber, then off in a few seconds. I have the charger that folds the plugs into itself so I wondered if that was it. I tried charging it on my computer also. Finally I plugged it back into the wall and held the power button down, not the U button, til the battery symbol showed up and it stayed on amber.