Why doesn't my macbook air connect with Hitachi projector

I have a new Macbook air. I have developed a powerpoint presesentation and got the adapter to connect to projector - Hitachi-CPX4015WN.
ALas, Hitachi does not recognize my computer.

Hello redffox,
Congratulations on your new MacBook Air! I found an article with steps you can take to troubleshoot issues with external displays like your projector. This article is for internal and external displays, so you can skip any steps referring to the internal display. I recommend reviewing the section titled "No video or no signal, image distortion, 'snow,' or flickering" in the following article:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Thank you for posting in the Apple Support Communities.
Best,
Sheila M.

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