I am the person that will be helping you today.
If the Nook does not turn on even while it is plugged into the charger, then the unit is faulty and needs to be replaced. If it does turn on while plugged into the charger, then the Nook requires a new battery.
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Thank you again, - Jason
P.S. If you do not know the answers to any of my questions or are confused about something, please tell me.