If you are not seeing your computer screen on both the computer and the projection on the Smart Board (or White Board), here is how to fix it:
Press and hold down the Home button on your computer.
While holding down the Home button, press the letter P button.
3. From the four menu options that appear on the right side of the screen, click Duplicate.
Now you will be able to see your computer screen on both the computer and through the projector on the board.