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The picture appears on my laptop screen, but not on the projector screen. Why?

Many Windows laptops automatically display on the projector, but some may require you to press a certain combination of keys.

Often this will be ‘Fn’ and one of the functions keys across the top of the keyboard (i.e. F5). Usually the correct ‘F’ key is marked by an icon of two computer monitors, or ‘CRT/LCD’. If you are uncertain about this, please consult the instruction manual for your laptop. 

For Mac laptops, if it doesn't autodetect, go to the Preferences menu, select 'Displays' and choose the 'Mirror Displays' option and the most appropriate resolution.

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This is question number 1393, which appears in the following categories:

Created by Chris Limb on 15 November 2007 and last updated by Samantha Jane Elmer on 2 September 2016