How about this; Control Panel, Sounds Speech and Audio Devices, Sounds and
Audio
devices, Audio tab, check Sound playback, and make sure dropdown has correct
item listed; also, in that tab, under Sound playback, click "Advanced", and
make sure your speaker selection is correct for your installed speakers; and
under "Volume" tab, Device Volume, Advanced, make sure "Mute" is not
checked. I am sorry, I know all this is simple stuff, but I just helped
someone the other day with the same symptoms, and this is where I found the
problem. Good Luck.
Willie