System Sounds randomly stops playing

[TechActivate781]

Hi,

In Windows 7 Ultimate SP1 x64, a few days ago I noticed that the startup sound did not play. I then realized that none of the system sounds are playing (btw, all non-system sounds were playing, so I don't think it is a driver issue). However, after randomly pressing on a program which prompted UAC, I realized that it played and other system sounds played. Not long after, they would not play when they were supposed to.

Why is this happening?

Thanks

 

[Phredtx]

Some Realtek Info

The following info from Realtek might be of some help or interest...

View attachment 0008-R282_Readme.pdf
View attachment ALC888S-VC.PDF

Phredtx

 

[file3456]

If you click the speaker icon and look at the different sound options are the system sounds muted?