1) Use the panel with buttons on the wall on the left or right side of the whiteboard.
2) Push the button "PC" to start.
Push "OFF" to end.
For change in volume push the buttons for "VOLYM".
3) Connect the computer with the cables at the desk.
4) Now - start the computer.
Please note that if there is no signal from the computer to the projector it will be turned off in about 10 minutes. Then you have to push "OFF" and then "PC" again to start.