If the device shows in Device Manager and there are no yellow exclamation marks in Device Manager it is probable that the device is correctly installed - and even more probable if there is a sound icon in the system tray. I generally start troubleshooting sound and music issues in the DirectX Diagnostic Tool; reached by entering directx in the run box.
Also are the speakers attached to the front or rear audio ports; rear is more standard. The front panel jumpers must be correct on the mobo header pins along with the cables to the front panel.
And not forgetting the obvious; is the sound turned right down or muted on any of the relevant parts.