I have a custom built computer with an nvidia card. The sound was working fine on my brothers TV but when I hook it up to my TV with the same cables it doesn't work. When I go to control panel, sound, playback. It shows that I am hooked up to Samsung-1 and there is the green check mark and everything. The nvidia HDMI output one says not plugged in. I have done all the trouble shooting I can think of. What more can I do?