HP ep7100 Series User Manual page 36

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.
If you want to adjust the picture, see "Changing the picture mode" on page 32.
36 User's Guide