macbook air wont work with data projector
Attempted to connect my mac to my data projector and it wont work?
If audio is needed, you'll need to more closely identify which MacBook Air you have:
About Mini DisplayPort to HDMI adapters
How to find your Mac's model and age?
If your MacBook Air is older than July 20, 2011, you'll need to identify whether or not it has a mini-Displayport, or a mini-DVI port:
mini-DVI
mini-Displayport
All technologies work well with the video of DVI or HDMI with the right adapter. VGA and S-Video you need the proper adapter, and you won't necessarily have all available resolutions that are lower.