Sometimes we want the image on the screen to disappear so that the audience is focused solely on the presenter. There are two ways to do this. The first is if you want to blank the screen with a black image, similar to shutting the projector off (we used to do this all the time with overhead projectors by just shutting the projector off). Just press the period key (.) on the keyboard and the image is replaced with a black image. Press the period key again and the image is restored.