I've been following the Eye of the Dragon tutorial, which is basicly a guide to making a 2D RPG game, obviously.

I recently finished the tutorial about making pop up screens in the menu and changed the screen to load as a full screen.

Whenever I try and load the game it just goes black and my mouse sits there. I cannot change out of it other then with CtrlAltDel. Once i do that it says No suitable graphics card found, unable to create graphics device.

I read somewhere about XNA not allowing more then one screen when any one of them is full screen. but it wasnt very informative. Anyone have any ideas whats going on and/or how to fix this?

Just incase if this helps this is the code for the graphics device:

public Game1()
{
    graphics = new GraphicsDeviceManager(this);
    graphics.PreferredBackBufferWidth = 900;
    graphics.PreferredBackBufferHeight = 768;
    graphics.IsFullScreen = true;
    this.Window.Title = "Eyes of the Dragon";
    Content.RootDirectory = "Content";
}