Sony/Philips Digital Interconnect Format, or S/PDIF, is a type of audio connection that uses a special jack. On computer systems, the S/PDIF connection is typically used to output audio streams to digital sound systems, such as a home theater speaker system or a digital audio receiver and is found on sound cards and newer motherboards with on-board audio. Users who prefer to use an analog sound connection or another audio interface can disable S/PDIF output completely.
Click on the "Start" menu button, click on "Control Panel," click on "Hardware and Sound" and then click on "Sound." The "Sound" control panel will appear.
Select the "Playback" tab if it isn't already selected.
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Right-click on the S/PDIF icon (it may appear as "Realtek Digital Output," "S/PDIF Output" or "S/PDIF," depending on your sound card or motherboard) and select "Disable" from the contextual menu.
Click "OK" to apply the changes and close the Sound control panel.