Digital Coaxial Output to AV receiver - Not working

[scubadaddy]

I have hooked up my LCD TV to my HP Desktop (9340f) using the S-video output on an Nvidia 9800GT video card.  The video is great, but I cannot get the sound to work from my Harmon Kardon AVR146 receiver.  I have connected the digital coaxial output on the back of the HP to the digital coax input on the back of the receiver.  

When I open the properties for the sound devices and test the Realtek audio output, I can hear the sounds (piano??) from the speakers that are hooked up to the receiver however, when I play video through windows media or play a video game there is no sound at all.   

Any suggestions??

[erico · Accepted solution]

have you gone to Control Panel --> Sound then  verify that Digital Output is enabled.  not speaker ouput. 

(If you are using Vista you should see a green check mark next to it)

It always helps if you tell us which OS is installed. That way no guesswork..I'm thinking perhaps ESP required.

[scubadaddy]

I am using Vista Home Premium 64 Bit (SP1).   When I open the properties for the Sound in the control panel the Realtek device shows enabled and working properly.    The desktop speakers are currently set as the default device.  Do I need to change the Realtek output to the default every time I want audio from my receiver instead?

Thanks !

[erico]

Yep. That is what you have to do.

[scubadaddy]

Selecting the digital output as the default device solved the problem.  Thanks for the help.