Both of you only have two choices.
If you left stock recovery on internal before it screwed up, you can do the 8 failed boot procedure and it will reset itself to stock.
If you replaced stock recovery with CWM or TWRP, you must boot to it or a bootable CWM SD so you can flash the plain stock zip I have in item 6 in my HD/HD+ CWM thread linked in my signature. To get to your custom recovery on internal, power up from the powered off condition and hold both the power and n button simultaneously for 5-8 seconds. Then first release power and then a couple of seconds later the n key. It should show the cyanoboot logo followed by the recovery.
If you cannot do any of those things, you are screwed.
Sent from my BN NookHD+ 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