Netflix will no longer connect on my Nook Color. Tried power off and back on. Tried reregister. just keeps asking for email and password over and over. Netflix is working on other devices--

go to Barnes and noble website.
Log in using your old name and password.
Click on My Account (upper left corner)
Bottom of page click on Manage Account Settings (on the left)
Fill in CHANGE YOUR EMAIL ADDRESS.

IF you no longer have your password AND no longer have your email, you can not access your old account. You will have to register at Barnes and Nobel as a new account.

While we are not Netflix and cannot effectively answer your question, the most common problem we see here are when people do not update their email addresses when they change them and thus the service is sending the password reset message to an previous or no longer valid email address.

Uninstall Netflix & reinstall again. Make sure not to save any settings if asked to.

NETFLIX CUSTOMER SUPPORT PHONE:
1-888-638-3549
PRESS 0 AT EACH PROMPT.
Average Wait: 5 mins - 24 hours, 7 days
OR
Netflix Calls You Instead
http://gethuman.com/call-back/Netflix/
http://www.netflix.com

Go to another computer and straighten out your netflix account. If it won't accept your email click on "forgot user name or email logon" if you your netflix account is set up properly with an email account you should get an email with your correct logon name.

if Netflix does not accept your login name you won't be able to fix it on the computer connected to your tv.

Or if TV is asking for a code number it could be asking for your wi fi password .

If you forgot the password then just hard reset it. Here is the method to reset your device:
Hard Reset Procedure For Nook Users

Press and hold power button and your "n" home button almost simultaneously (Power first and the "n" )
Hold these until your screen flashes the "Touch the future of Reading" message, wait 2 seconds and release buttons.
You will then get a Prompt asking you if you want to reset it to the Factory Settings. Good Luck.

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