The only way to connect your computer to projector is through an HDMI cable. The controls for audio and video are through the Crestron Remote (pictured below).
HDMI Connection
When connecting the HDMI cable "Left" or “Right” wall input.
You will need to select the correct "Pick Source" (Left or Right) and then "Send to Projector".
Audio/Ceiling Speakers
You do not need to go into the cabinet to turn up volume on the amplifier. There is a “Volume” selection on the Crestron remote.
Turning [OFF] Projector
Select “Exit” on the Crestron remote and it will turn off the projector and Crestron system.
Return Crestron remote to the docking station to charge.