you connected a computer to the projector's Computer
port, you 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 Communication On as the Standby Mode setting and Always On as the A/V Output setting in the projector's menu
Monitors that use a refresh rate less than 60 Hz may not be able to
display images correctly.