[Nook HD, HD+ General] HiddenG:
Dear Rorifett,

Apologies for all the problems occurring to you. I'll do my best to assist. For now, I'll quickly detail a little on the installation process. ;)

From the sound of it now, it seems as if your SD card has become corrupt. I would download SDFormatter and format your SD card via your computer. The link I have just posted, click on "SD Formatter 4.0 for Windows Download" or "SD Formatter 4.0 for Mac Download" on the left hand sidebar respectively, and the download should begin after accepting their terms.

After downloading, please install. Then whilst your SD card is inserted into your computer, format it using SDFormatter (ensure the correct drive has been selected). This software should format your SD card, deleting all partitions and restoring your full storage capacity.

If you're on Mac, please reply and I will detail the installation process. However, if you're on Windows, download Win32DiskImager. Create a folder on your desktop, call it "Win32DI" (for example). Extract the contents of the download into that newly created folder. Ensure your SD card is a minimum of 4GB, if you have a 2GB SD card, please reply and I will detail the use of 2GB.

Now download NookHDplus-bootable-CWM-6028-for-stock-4GB-rev4-(05.15.13).zip, extract it. You should have an .img file. Do NOT create the partitions on your SD card manually, unless this method does not work. Now, run Win32DiskImager. When it loads up, select the NookHDplus-bootable-CWM-6028-for-stock-4GB-rev4-(05.15.13).img file. Now, burn that to your SD card using your computer. Ensure the correct drive has been selected within Win32DiskImager; the drive should be your SD card. For example, F: may be the drive letter for my computer, this depends on your setup.

After the IMG has burned onto the SD card. Transfer your EMMC CWM (cwm-recovery-ovation-2.zip), ROM (cm-10.1.3-ovation.zip), and optionally gapps (gapps-jb-20130812-signed.zip). Copy those files from your computer to your SD card. Do not create a new folder in your SD card. Just paste those files in there, it doesn't matter if it gets mixed up with all the files on the SD card at the moment.

Once you have put the files onto your SD card, right-click on your SD card in Computer, and select "Eject". Once Windows says it's safe for you to eject your SD card; remove the SD card from your computer. Now do the following:

Turn off your Nook;

Insert the SD card;

Turn on your Nook;

You should see the "Nook" logo, then overwritten with the "cyanoboot" logo. If this is not the case, please keep trying. Newer Nook models do not always boot up first time for some reason. If the "cyanoboot" text does appear, do NOT touch your tablet. It will automatically turn off, restart etc. then eventually go into CWM. Do not turn off your Nook or better, do not touch it during this process. If after so many tries, for example 10+ you could try another SD card perhaps? Or you could try buying a cheap one off eBay? It could be your SD cards or your computer I'm thinking.

If you eventually get into CWM, just factory reset/wipe data, then "install zip from sdcard" and again, "install zip from sdcard".

Firstly install CWM, then the ROM, then gapps.

Once done, press (press, not hold) the power button twice; so that you're back to the root menu.

Remove your SD card, and select "Reboot system now".

After the above, you should be good to go. However, I do believe you're having problems on step 4. I hope this guide should help you overcome this obstacle.

All the best, and keep us informed. :)