a DVI-to-HDMI adapter cable is used to connect the video. The audio must be cabled separately as DVI transfers only video. The HDMI circuit detects the DVI signals and switches to the DVI protocol.

If you are using VGA to HDMI or DVI to HDMI, they do not support audio. Third, the audio is not at mute either from the TV or the monitor. Done with the basic troubleshooting, let’s take a look ...