After reinstall computer SC2 is ok just SC . Has no sound uninstalled and reinstalled with no luck.
Check if SC:R sound is muted in Windows Volume Mixer. Also, make sure sound is turned on in SC:R options.
Sometimes Sound is maybe to low… increase volume…
Othertimes the sound seems to bugg… If you are tabing or activating ,deactiviting to often per hotkeys … really annyoing