Remove the large gray remote control from the cabinet. The volume buttons on the remote control will not change the volume. Connect your laptop's power cable to your laptop. Often the correct connection is the only one where it fits. Plug one end of a network cable into your laptop.
Some laptops come with a special adapter that links the laptop to the network cable.
Align the number wheels on the padlock to the correct combination. Move the number wheels so no one else will see the combination. Remove the large gray remote control from the cabinet. Turn on your laptop. After the main Windows screen appears on your laptop, check to see whether you can see the same screen displayed from the video projector.