Why can't I get an image or signal from Air to projector?

Even with the VGA displayport to VGA adapter, no signal seems to et to the projector, display option so not show projector.

Welcome to Apple Discussions
You're certain you are coming out of the MBA into the IN VGA port on your monitor? If the adaptor and cable are working your MBA should automagically detect the projector as a connected monitor in the System Preferences:Display control panel. Has the cable worked with any other computer?
Information included with your Projector should describe the resolution it supports. If your MBA resolution is set outside that parameter that may be why you see no image. However, the Monitor should either display "no signal detected" (which tells us the port, adaptor or cable may be at fault or some image, if it detects a signal.

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