First right click my computer in the desktop then properties then hardware then device manager then expand the audio,vedio and game controller see wether the driver is installed properly if not installed it will show yellow question mark the reload the correct drives from the cd which you recived with your computer install the audio software and restart the system then in the taskbar you will see the speaker icon right click them click adjust audio properties in volume move the slisders to full on uncheck the mute then restart your computer

Make sure you install the audio driver correctly. You can get it from this link, but make sure you search the correct motherboard model. Please let me know if you need further help. You may contact me just click here to keep in touch