[JimRB]

I too also have had problems with the onboard sound for the AC'97 on the ASUS P4P800 series motherboard.
I had tried all solutions with no luck.

With the problem I experienced the audio would quit working .
I would check it by clicking the speaker Icon .

A tone would sound through the speakers and the message "Media device not installed would appear"


Just recently I got it working again and during shutdown the audio cut out .
I went to the MSCONFIG file and looked at Services.
I noticed that the Windows Audio service was stopped for some reason.
I couldn't resart it from there but went to control panel and administrative tools and clicked Services.
The Windows Audio was set to Automatically start but it was stopped.
I double clicked on it restarted it and then checked on the recovery tab.
In the recovery console I changed the selection to Automatically restart on all three levels of the device failure.

And without removing and reinstalling the driver the audio worked .

Finally!!!!!!