You may be able to connect certain displays to your computer with or without an adapter.
Your computer, display, or graphics card may have more than one video output port. Each type of port requires a special cable.
If the display you want to use has a port that is different from those on your computer, you may be able to purchase adapters or other products from third-party manufacturers to connect them. (You may also need to update software so that your computer works correctly with the display.)
For example, you can use an adapter to connect a flat panel display to an earlier computer.
See your Apple-authorized dealer or check out the Macintosh Products Guide (http://guide.apple.com/) for more information.