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I have a digital audio (S/PDIF) driver installed. I can see that songs are played, but there are no sounds from my speakers and headphones. I am using Windows 7.

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It is really hard to help you this way. Please be more specific: How do you connect your speakers/headphones to your computer? Which software are you using to play music? How did you configure your sound driver? Right click on the volume fader / speaker icon in the system tray and select "Mixer". Make a screenshot. Which playback device have you selected, etc.? –  slhck May 27 '11 at 19:31
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Please navigate to Control Panel > (select Small Icons from the view menu at the upper right) > Sound and go to the Playback tab (should be the first one). What devices are listed there? Which device has a green checkmark next to its icon? –  jcrawfordor May 27 '11 at 19:34
    
@jcrawfordor I'm not on 7 atm but doesn't that default device icon have a mini equalizer next to it that animates when sound is played? If it does, it might be a good troubleshooting step while he's there. –  Blomkvist May 27 '11 at 20:10
    
Excellent point. it's a bar to the right of the device title. You should try playing some audio and seeing if that bar shows output. –  jcrawfordor May 28 '11 at 3:48
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2 Answers

In your sound options, make sure that S/PDIF is selected as your default output. It could still be trying to send it to your 3.5mm jack.

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You can also try to run the Windows 7 Sound Diagnostic to see if that can help reconcile the issue: http://windows.microsoft.com/en-us/windows/help/no-sound-in-windows

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You can also get to the diagnostic within your computer right now: C:\Windows\diagnostics\system\Audio\DiagPackage.diagpkg –  Paxamime May 30 '11 at 4:51
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