KB953500

If you move a High-Definition Multimedia Interface (HDMI) cable from one HDMI output port to another HDMI output port on a computer that has multiple HDMI output ports, Windows Vista will not detect the change in HDMI cable connections. When this occurs, the default audio playback device in Windows Vista does not automatically shift to the next available audio playback device.

Additionally, Windows Vista may report that the audio playback device is working, even though the HDMI cable is not plugged into the HDMI port.

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