I had a problem with my motherboard p8h67-m pro before 2 weeks. My pc started to shut down by its self. I sent it fo repair and they change my motherboard to p8h77-m. I have 8Gb memory and Gtx 550ti nividia video card. From the moment my pc arrived I have no sound . I make my google search but nothing works. When I put sound I see my toolbar sound to get green , and when I put the cable to rear green slot it starts recognition program from asus motherboard. But no sound. Is there is anything you can suggest me? thank you for your time