I have a black background and white letters on my nook reader. How do i change it back to white background and black letters?

Some formats are NOT epub. The formats are specific to their ereader which can be on a computer (but not other ereaders). Some sites do not make this clear in the description. You need a pdf or epub format. Comic with .cbr, or .cbz will also work.

I assume you mean the Nook keyboard doesn't allow switching between numbers and letters. The built in Nook keyboard isn't the smartest or only keyboard app out there. Now that it's totally free strongly recommend you go into the Google Play Store and install SwiftKey. One hour using it and you'll wonder why you ever put up with Barnes and Nobles chunky idea of a keyboard. Even Google itself has their own keyboard app. You can have multiple keyboard apps installed at the same time. Just use the Switch Keyboard option to toggle between then.
As far as SwiftKey is concerned one of the main features that first sold me on it is it can be resized. I always hated the Nook keyboard just took up so much of your available screen space leaving so little for the input area. Did you know SwiftKey can be setup to show a numbers row at the top just like a regular PC keyboard? Also it can learn your typing patterns over time and predict the most likely word you will use next. Just click the word in the predictions bar.

Steps To Change Font Size On Nook Tablet
Step 1: Chose a book that you would like to read on your Nook.

Step 2: Next, view the Reader Settings

Step 3: Tap the screen to expose the menu, where you will see a "Text" icon.

Step 4: After having clicked on the "Text" icon, you will see that you have the option to change the font size. There will be a letter "A" that will allow you to change the size. Click on the "A" and decide which font is best for you.

Step 5: Touch the main screen to return to your book.

If you still have any kind of problem then you can take nook color support from experts by calling nook help number. You can also navigate to www Nook com for more information.

A few items can only be read on a PC or Mac using the Nook Reader. Have your title, price, date, and book ISBN number handy. Then contact Customer Support for a refund.

Nook is among the most popular e-Reader devices after Kindle. If you are using Barnes & Noble Nook and facing a certain issue in the device, then you have to take Nook support. If you find nothing useful on the website, then Call Toll Free No. +1(844)-305-0086

You need to download the Nook for PC app.

barnesandnoble com

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

Unless you have made a backup or synced to a server, you cannot get the data back.

Yes.. i use a very good step by step site to fix such issues. Even though i do it all day it helps to have it planed out like this.

http://www.ifixit.com/Guide/Nook+Tablet+Display+Replacement/11148
hope this helps
chad man

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