I have n68c-s ucc mobo, with V7700d codec, when I turn on pc, sometimes there is a sound, sometimes no, I need to restart my pc 2-3 times to get the sound, but there is a sound when pc turning on and off, but when I want to playback something it says bad sound driver. Im using windows 7 32 bit. When I install V7500 F HDMI, there is only stereo. Is there a solution, or is it bad onboard sound device?