Udah coba di reset belum Audio Devicenya?
Coba cek step yang saya dapatkan dari forum lain : http://en.kioskea.net/forum/affich-19131-sound-won-t-work-at-all
-Open Start menu, open control panel
-Scroll down to 'Device Manager', click 'View Hardware and Devices'
-Double click 'Sound, video and game controllers', then double click 'Realtek High Definition Audio'
-This will open the properties menu for your audio. At the top of the box, click 'driver'
-Finally, click the 'Disable' button, and then the 'Enable' button afterward to reset your audio system.