When I play a DVD on my computer, I do not get any sound.  This
applies to both my DVD/CD players, and also to an external DVD/CD
player when I attach it via USB.  On the other hand, music CDs play
normally. The volume controls are all set to their maximums, and none
of them are muted. Any assistance will be appreciated.

What software are you using to play the DVD?

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Clarification of Answer by gregaw-ga on 26 Jun 2006 05:41 PDT

I appologize...

I meant to post a request for clarification, not an answer.  I think
this is more than likely a software issue.

Try downloading a different DVD player and see if it works for you:

http://www.download.com/Blaze-DVD-Player/3000-2139_4-10439071.html?tag=lst-0-1

This is the most popular player on download.com.

I'm confident we can get this resolved.  Please let me know if this
doesn't work and I'll continue to work on it.

Thanks!

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Clarification of Answer by gregaw-ga on 20 Jul 2006 13:57 PDT

Have you tried using Windows Media Player?

Here are a few solutions for someone using that having problems:

http://www.daniweb.com/techtalkforums/thread37410.html

This is probably not a driver issue, but update your sound card driver
just in case.

Verify your "default sound playback device" (in Windows, Control Panel
- Sounds and Audio Devices - Audio). If more than one device is listed
in the drop-down box: change the selection, click Apply, click Volume
(under "sound playback"), unmute and maximize every control.

I experienced a similar problem when I set up Skype with a USB phone
adapter. The solution was twofold: 1)change the default audio device
in Windows' Control Panel and 2)select the corresponding device in
Skype.

Thank you Gregaw and Audiothink for your suggestions.  I tried them
both, but unfortunately neither solved my peculiar audio problem.