Three suggestions:
In Device Manager uninstall/disable all the sound/audio devices and than 
restart Windows to reinstall/enable them.
If there is a CD that came with the MB, reinstall the sound/audio drivers.
Sometimes the sound volume gets muted by mistake.

I hope this helps.

Tom

Quin Selman wrote:
> Hello PCBUILD,
>
>   I built this computer about a year ago and, until now, it's
>   been working fine.
>
>   A couple of weeks ago I shut down my computer as usual. The next
>   morning Windows booted up as expected but with no sound. I've had no
>   sound since.
>
>   The Computer: Home build in Antec case with fans.
>
>   ECS NFORCE4M-A motherboard
>   Windows XP Home Edition Service Pack 3 (build 2600)
>   2.00 gigahertz AMD Athlon 64 X2 Dual Core
>   2048 Megabytes Installed Memory
> NVIDIA GeForce 8500 GT [Display adapter]
> HSD HW191D [Monitor] (19.1"vis, s/n 643GH3CY15165, October 2006)
>
> The Problem: No sound, as mentioned above.
>
> I've exchanged speaker sets with no success; I've exchanged on-board
> sound to sound card with no effect. I've examined the Hardware section
> in Control Panel, Sounds and Audio Devices (everything is grayed out
> in this section so its not workable), No problems in Control Panel,
> System. No problems here except for the grayed out section I've
> mentioned above.
>
> When trying to access sounds I get various error messages such as
>
> "There are no active mixer devices available." "and No Sound Device",
> and "The Audio device supported by this application not detected."
>
> Any suggestions?
>  Quin
>
>                        
>   

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