The Mac adaptor is a small white cable with a connector at each end. It connects the Mac to an external screen or projector and quite simply if you don't have it nothing is going to work.
Mac have made up to six different types of connectors and as a result have always supplied the connector with the laptop when its purchased or in some later models expect you to purchase it as an "add on" after you have just handed over $2500.00 for the latest and greatest.
WE DO NOT SUPPLY THIS PART - IT IS AN APPLE PART.
For those who forget to supply it, we charge $50.00 (for the Mac Adaptor KIT) and an extra deliver fee - please don't find yourself in this situation.
If you want to NERD UP and read endless pages of numbers, special names and acronyms - go here and check this out - pay attention! - http://en.wikipedia.org/wiki/Mini_DisplayPort