Sounds like you may have damaged the charging socket for the Nook Tablet.
Try cleaning it with a toothbrush to ensure there is no dirt of obstruction in it ... put a little isopropyl alcohol on the brush.
https
/www.ifixit.com/Guide/Nook+Tablet+Battery+Replacement/10924
Remove the battery and clean the contacts ... check and see if it has any charge in it with a multimeter.
If the battery is charged and it still will not turn on then the device is damaged.