I have a sharp 37" Aquos LC-37D43U. My Sound system is connected to TV through Optical cable. All devices works fine on those 2 HDMI ports. I recently bought a Google TV box CS918S Quad Core Android 4.2.2 OTT TV Box 4K*2K Allwinner A31S 2GB/16GB XBMC. The box is tested at my friends place and works fine. While I hook it to my TV using any of the HDMI port I get only Video. There is no Audio. I have checked both cable and box at my friends place and they work fine. Is there anything I can do to fix this problem?