Sony PCG-GRX500K - Manual (Page 78)

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3 Plug the display cable (not supplied) connector into the VGA port, and plug
the audio cable (not supplied) connector into the Headphone jack.
4 Plug the opposite end of the cables into the appropriate ports on the
projector.
5 Verify that the power cord is plugged into the projector and an AC outlet.
To change the display when connecting an external computer
display or projector
When you connect an external display to the VGA (Monitor) port, you can
toggle the output between the Liquid Crystal Display (LCD), the external
monitor, or both devices.
Connecting a Projector to the Notebook
✍
See the manual that came with your projector for more information on its installation
and use.
Projector
Audio cable
Display
To VGA port
(not supplied)
cable (not supplied)
To Headphone jack
Power cord