I just purchased Dell 3750 laptop and my wife's external Samsung monitor. HDMI links the display to Dell laptop. Audio doesn't come when the display is paired. The HDMI link takes the playback from Dell and delivers the signal to your computer, I'm fairly convinced. Issue is, there are no speakers on the display-so audio is not available. If I detach the Hdmi, the Dell plays sound but then no outside screen is attached.