When an HDMI cable is connected, no video is sent via the component video connections. Apple TV (1st generation) is meant to be viewed on a single television. For more information, see the Apple TV (1st generation) technical specifications.
Apple TV (1st generation): HDMI takes precedence over component video connections if both are connected
Apple TV (1st generation) has both HDMI and component video connections. If both HDMI and component cables are connected, the HDMI connection takes precedence over component video.
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