Since you did nothing to it, I suggest you exchange it at B&N. But if you want to try to fix it yourself, go to my HD/HD+ CWM thread linked in my signature and make a bootable CWM SD and use that to flash a plain stock zip from item 6 followed by a factory reset with CWM.
Or you can interrupt the boot 8 times in a row and it should reset itself to factory ROM.
Sent from my SCH-i705 using XDA Premium HD app
See my Nook Color Tips Thread here
and my Nook Color EMMC Partition Repair Thread here
and my Nook Color Updated CM SD Installation Instructions here
and my Nook HD/HD+ stock tips thread here
and my Nook HD/HD+ CWM Root Tools thread here
e.mote's Nook HD/HD+ Dummies Guide for installing CM10.1/CM10.2 here