May be you need to install audio driver, check it at device manager
follow this step:
go to device manager, look at device manager, is there any yellow mark (?) or (!)?if yes this mean you need to install audio driver, just insert your motherboard cd driver, then click install audio driver, follow instruction at installation until finish, if installation success at device manager the yellow mark will disappear, the try play sound, for example using windows media player, you will get sound at your speaker
i hope this helpful
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