Symptoms

You are running a presentation on a portable computer and a projector, but the image of the desktop from your computer is not being projected.

Cause

This symptom is most often caused by a lack of signal transmission between the computer and the projector.

Resolution

To restore signal transmission, first turn off both the projector and the computer. Then turn them both on again — turning on the projector first, and only then the computer.

If you are using a portable computer, you may need to manually activate or deactivate the computer’s video port in order for the computer to send a signal to the projector. Some portable computers provide three states for video port activation:

• State 1   Activation of the computer’s own display only
• State 2   Activation of the computer’s external video port only
• State 3   Simultaneous activation of both the computer’s own display and the computer’s external video port

The command for activating the video port will usually toggle through all three of these options. Refer to the documentation for your computer to find out how to run this command.

If activation of the video port does not cause an image to be projected, wait 45 seconds, and then run the command again.