You can try it with another computer or another TV. Second, figure out if both sides of the ports are HDMI. If you are using VGA to HDMI or DVI to HDMI, they do not support audio. Third ...

[eta] found herself in a flat with several LKV373 HDMI ... to the TV/sound system, no fussing with wires behind the TV. However, [eta] wanted to get rid of the need to plug in a laptop and start ...