iMac (Flat Panel): How to Connect an External Display or Projector

This document discusses how to connect an external display or projector to your computer.

This article has been archived and is no longer updated by Apple.

You can present what's on your iMac's display on an external display or projector.

You need a VGA Display Adapter cable, available at, and an external VGA display or projector that supports at least one of your computer's display resolutions (640 x 480 at 60Hz, 800 x 600 at 75Hz, or 1024 x 768 at 75Hz).

Note: You can't connect a second monitor to extend the desktop.

You can also mirror the computer's screen by connecting a television to your computer using a scan rate converter. (Some televisions have a built-in scan rate converter.)

Connecting an external display or projector

To connect an external display to your computer, follow these steps:
1. Connect the monitor cable to the VGA Display Adapter cable.
2. Connect the VGA Display Adapter cable to the VGA output port.
3. Choose a VGA display resolution from the Display Resolution portion of the Control Strip.

To adjust the screen image, use the Monitors control panel.

Note: The VGA output port and Apple VGA Display Adapter cable support most monitors with a VGA-style connector. Most monitors have this connector. If you use an older Apple monitor that has a DB-15 connector, you may need a Mac-to-VGA adapter, which you can purchase from an Apple-authorized dealer.

Connecting a television using a scan converter

Some televisions can be connected directly to the VGA Display Adapter cable, but others require a scan rate converter. A scan converter converts the signal from the computer into a signal compatible for viewing on a television.

Scan converters are available from other manufacturers. One may also be built into your television. Follow the directions that came with the scan converter to connect it and adjust the picture. For more information, see the documentation that came with the scan converter or your television.

( This information is gleaned from the Info Center online help system, which is located on your computer's hard disk.)

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