What to do if your NOOK is not detected by Adobe Digital Editions
When transferring titles to a NOOK, it is important to make sure your NOOK is connected to your computer before you open Adobe Digital Editions (ADE).
When a NOOK is recognized by ADE, a you'll see it under 'Devices.' If you can't see yours, this article should help.
Note: These instructions are for ADE 2.0. Please make sure you're using the most up-to-date version before continuing.
Note: With the NOOK Tablet, Color, HD and HD+ you can install OverDrive's mobile app to download titles directly.
If you are not able to see your NOOK icon under 'Devices' in ADE
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Close out of ADE, and unplug your NOOK.
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Reconnect your NOOK, and wait a few moments.
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Open ADE (in 'Library View').
The Library button is in the top-left corner of the ADE window when an eBook is open.

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Your NOOK should show up under 'Devices' on the left side of the screen.
If you still can't see your NOOK in ADE using Windows (Mac users find steps below)
The next step is to make sure that ADE is properly authorized on both your computer and your device.
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In ADE, go to Help > Authorization Information…
If this option is greyed out, authorize your computer.

The authorization window opens and shows you what ID you're currently using for your computer.

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Now that we know your computer is authorized, you'll need to reset the ADE folder on your NOOK.
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Close ADE.
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Connect your NOOK to your computer.
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Double-click your NOOK under 'My Computer' or 'Computer'.
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Locate the folder .adobe-digital-editions, and delete it from your NOOK.
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Open ADE. Drag the eBook you'd like to transfer up to your device.
ADE will automatically register your NOOK with the same ID that you're using on your PC.

If these steps do not correct the issue, please try a factory reset on your NOOK.
If you still can't see your NOOK in ADE using a Mac
The next step is to make sure that ADE is properly authorized on both your computer and your device.
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In ADE, go to Help > Authorization Information…
If this option is greyed out, authorize your computer.

The authorization window opens and shows you what ID you're currently using on your computer.

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Now that we know your computer is authorized, you'll need to reset the ADE folder on your NOOK.
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Close ADE.
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Connect your Kobo to your computer.
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Open your Kobo from Finder.
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Press Command + Shift + G.
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In the 'Go to Folder' window, type '/nook/.adobe-digital-editions'.
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Make sure the bold section of the path above ('nook') matches the name of your NOOK which is shown on the desktop when you plug it in.
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Move the contents of the '.adobe-digital-editions' folder to the trash.
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Open ADE. Drag the eBook you'd like to transfer up to your device.
ADE will automatically register your NOOK with the same ID that you're using on your PC.

If these steps do not correct the issue, please try a factory reset on your NOOK.