Thank GOD!! This worked!! OP should update the 1st post with these instructions so that newbs don't ready through 10 pages of "just be patient" and needlessly reboot their NookHD+ 4,342 times.For those having trouble booting this has worked every single time for me.
1) Load up the stock rom so you can register it, if you haven't done so already
2) Factory reset the device
3) After it resets and loads to the screen asking you to enter a language put in your sd card
4) Continue to enter information as you normally do
5) Afterwards it should download a software update and reset itself then the CWM screen will load.
Make sure you let the tablet update and reset itself or you'll have to start over.
This has worked for me every time I've gone from stock to cm.
Thanks kodochax.
smithmal