About the iMac (Early 2006) and iMac (Late 2006) Mini-DVI video out port

Using your iMac (Early 2006) or iMac (Late 2006) computer's Mini-DVI video out port, you can mirror the built-in display video on an external display or extend the size of your Mac OS X desktop (extended desktop mode) by connecting a compatible DVI display, VGA display, or projector and the appropriate Apple Mini-DVI adapter:

• For DVI displays, use the Apple Mini-DVI to DVI Adapter (M9321G/B).
• For VGA displays or projectors use the Apple Mini-DVI to VGA Display Adapter (M9320G/A).
• For televisions, projectors or VCRs that use S-video or composite video connectors, use the Apple Mini-DVI to Video Adapter (M9319G/A).

What choices do I have?

Video mirroring allows you to view the image displayed on the iMac's flat-panel display on an external monitor, television or projector.

Extended desktop mode allows you to use the screen area on an external display in addition to the display in your computer.

You can switch between mirroring and extended desktop mode by opening System Preferences and clicking 'Displays'. Click the Arrangement button to set your primary display.

Connecting an external display is designed to be "plug and play". Simply turn on your external display or projector, and connect the appropriate adapter to the display (see above). Then connect the adapter to the Mini-DVI port located on the back of the iMac.
Tip: To make sure that your iMac automatically detects the external display or projector, be sure you plug the adapter into the external display or projector before you plug it into the iMac.

Resolutions

When you connect the adapter to the computer, the screen may refresh momentarily as the computer prepares itself for the new video output. When the computer is mirroring video, it tries to synchronize the resolution of the built-in and external displays. If they can't be matched, the computer will change the resolution of both screens to the highest common resolution which may cause areas of the built-in display to be blacked out.

You can switch resolutions and frequencies for both the iMac internal display and the external display, television, or projector using the Displays pane of System Preferences.

To display a a DVD movie disc on a television that's connected to your iMac, select a 720 x 480 NTSC (in the United States) or 720 x 576 PAL (in Europe and other regions) resolution in the Displays pane of System Preferences.

Tip: Because of the display limitations of most televisions,the images displayed on a television screen are usually not as high quality as those on the built-in display or an external monitor.