My nook color has frozen screen and won't shut completely down

You can first try doing what's called doing a Soft Reset. It's the first and preferred method to try as you don't lose any files or settings. Hold the power button until the Nook turns itself off. In most cases that will be twenty seconds or more. Then turn the power back on by holding the power button down for about two seconds. Hopefully this will allow you to complete a normal boot process. The second and more dramatic way to get a working Nook back is what's called doing a Hard Reset. This process will put your Nook back to "Just Out of the Box" mode. You will lose any files and settings stored internally inside the Nook itself. The good part in all this is it won't touch anything stored externally on your external SD Cards. To do a Hard Reset Turn the NOOK off completely. Hold the Power button and Home (n) buttons. The device will turn on. Continue to hold both buttons until the device shuts off once again (~15-20 seconds). Turn the device on normally. It will prompt for a factory reset. Press the Home button twice to confirm. ------- The important part in the above is to be sure you start the Nook via holding down both the power button and the Home (n) buttons at the very same time and keep them both pressed down until the Nook turns itself off.

Try these two simple methods: Troubleshoot Your Nook Frozen Screen With 2 Simple Methods
you can also call call Nook Customer Service Number @ +1(844)-305-0086 (Toll-Free).

1. Ask your daughter to Sign-In to her B&N account.
2. Under the My Account heading you will find Digital Content/Management.
3. Choose Manage Your Nook.
4. You will receive a screen with a picture of your Nook (if she has more than one on her account...be sure to look at the serial number).
5. Once chosen you will be given the option to Erase & Deregister Device.

hold your power button and hold your home key both at the same time for 1 min

Thats because it is in your unit's "registry." You may have deleted it when you should have uninstalled it.

try to hold your power button and home buttom at same time or 1 min it will rebooth it

you can use a debit card

I'm having the same problem! Have you found a solution!!! Help!!

From what I have found on this issue it looks like you will need to restore your nook back to factory settings. Any books you bought and backed up from Barnes & Nobles should re-download once you have restored the device and re-registered.

To complete a factory fallback:

1. Turn your device completely off.

2. Power up the device while holding in both the power button and the physical "n" button at the bottom of your NOOKcolor.

3. The device should begin to power up and you will see the welcome screen however keep holding both buttons down and the device will power down.

4. Repeat step 2.

5. When the welcome screen comes up, release both buttons.

6. The device will begin to power on and then a window will pop up asking if you would like to restore your device. Press the "n" button once and again to confirm.

7. The NOOKcolor will restore itself to full factory defaults and will startup as if it were brand new.

8. Re-register your device (while connected to a WiFi network) and you will start over fresh

In order to start using your Nook, you'll need to register it through the Barnes & Noble website - I've shared the steps below. Once you've registered it, you will be able to start purchasing and reading books. Please note that you will need to set-up a B&N.com account first. That is done on BN.com and simply click "new user account." Once you have set that up, follow the below Nook set-up steps.
NOOK Set-Up Steps

1. Charge your new NOOK 3G or NOOK Wi-Fi for 3-hours from a wall outlet using the Power Adapter and USB Cable packed at the bottom of your NOOK box.
2. Turn on your NOOK by pressing the power button at the top.
3. Connect to Wi-Fi.
4. Register your device by entering your BN.com account email.
5. Tap the down arrow button in the lower right corner of your color touchscreen.
6. Enter your BN.com password.
7. Tap Submit