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However, when if I happen to connect an external monitor or projector while the computer is turned on and press the Fn + F8 key my PowerPoint screen image increases to 400%, which is the maximum, and if I go to presentation mode I can't advance any slides as it goes back to slide one after I press enter.
A projector or image projector is an optical device that projects an image (or moving images) onto a surface, commonly a projection screen. Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers.