Sound system completely not working

Dear Sir,

I have a HP Pavilion g6 Notebook PC running Windows 8 Single Language 64-bit,

Serial no: 5CD3042D34. All of a suuden a few days back when I opened the system I found sound system not functioning at all. I cannot hear any sound from either the speakers or the head set. I even tried recovering my sysem using recovery CDs, still I am not geting back the sound.

Could u please help me.

Thank you,

Parvathy