you connected a computer to the projector's Computer
can also connect an external monitor to the projector. This lets
you see your presentation on the external monitor even when the
projected image is not visible.
If you want to output images to an external monitor
when the projector is turned off, you need to select Always On as the A/V Output setting in the projector's
Monitors that use a refresh rate less than 60 Hz may not be able to
display images correctly.