I am ouputting video from a Power Macintosh AV to an external video source using the S-Video port. The Monitors control panel is set for 256 colors yet the video appearing on the television monitor is in shades of grey.

There are two different S-Video cable adapters provided with the Power Macintosh AV computer. Using the S-Video cable adapter marked IN instead of the adapter marked OUT will produce this result.

Externally, the adapters look identical except for the IN/OUT markings on the flat part of the connector. Internally, they have different wiring which will cause the loss of color signal.