HP (Hewlett-Packard) ep7100 Series User Manual

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User’s Guide
Showing video
3. Press the source button on the projector or remote control one or more times 
to select the DVI port.
4. If the computer display is not shown on the projector, you might have to turn 
on the computer’s video output port. For example, some computers require 
you to press a key combination, such as Fn+F4 or Fn+F5. See the user 
documentation provided with your computer.