When i connect HDMI to my computer video only works on tv and not audio! the speakers on the pc has a red X on it and says NO AUDIO OUTPUT DEVICE IS INSTALLED!! in sounds, playback there is a LG-TV1 Nivida high definition audio and it's set as default device and i can't even change the default to the speakers conexant smartaudio HD which is the only other option it won't take PS i have a toshiba satellite L755-M1KU and LG TV please help me!