Vista - No Sound

I upgraded to Vista two days ago and then had the "no audio device found" problem. After trying several different things, I located a SigmaTel HD Audio Codec through Dell (I have a Dell Diminsion E510 w/Zylux speakers). Now, the "no audio device found" seems to be fixed--in that the little red box with the x is gone, and the volume indicator shows the volume is going up and down when I'm testing. Of course, I still can't hear any sound. I'm at a loss. I've unplugged the speakers several time (they make a nice humming when I plug them back in so I don't think they're the problem). I've rebooted so many times I've lost count. Any suggestions?

Can you right click on the speaker icon, choose playback devices, then do you see a tick next an audio device:

Go to its properties and make sure both boxes are ticked in the advanced under exclusive mode.

Can you right click on the speaker icon, choose playback devices, then do you see a tick next an audio device:

Go to its properties and make sure both boxes are ticked in the advanced under exclusive mode.

There's a tick next to the audio device, and both boxes are ticked under advanced. I'm new here...I have no idea what a PM is

PM is private message. Does device manager show any exclamation points? Even so, in device manager, what is your sound device. We can try uninstalling the driver, rebooting, then reinstalling a new sound driver.

Device manager doesn't show any exclamation points. Under "Sound, video and game controllers," it lists "SigmaTel High Definition Audio CODEC." My entire system came from Dell when I originally purchased it. On the back of the subwoofer, it says, "Zylux Multi Media Computer Speaker System." Originally, I thought maybe I had the wrong driver, but I think SigmaTel makes Zylux.

I tried uninstalling the driver. When I rebooted, Vista automatically reinstalled the SigmaTel driver. Do you think I should completely remove the software when I uninstall the driver? Do you think I should use a different driver? During my "no audio device found" problem, I tried several different ones that didn't work.

3swordlillies

Do you have green lights showing when sound is being produced...
or are the green bars showing anything when sound is being produced:~

Yes; I have green bars when I'm trying to play something (but I can't hear anything).

I've heard of this problem before but it seems as if the Sigma driver just doesn't work. To test, can you try out a USB sound card such as the X-FI Creative go! USB?

I think you may have the wrong driver installed. Please re-check this and then show me what it says on your sound window.

Also what did you upgrade to. Was it Windows X32 or x64?

Try this http://support.dell.com/support/topi...n&s=gen#Issue1