Windows Laptop: No Speaker Sound After Connect to External Monitor using HDMI ?

(Updated in March 03, 2016) Sometimes we get issues on computer speaker sound, the one case is when you connect the laptop to an external HDMI monitor.

The main content below was written in Jan 20. 1990;

The last time we talked about how laptop connects an external monitor using HDMI and without lip keeping on open.  However, you might find you could not listen to music through the laptop speaker after you connected.

Why does the Speak not Work after Connecting to external Monitor ?

The reason is that if you connect the laptop to external monitor using a DHMI cable, Windows (at least in Windows 8.1) system will set the sound playback device to the external monitor by default since it found the HDMI cable which suppose both of Video and Audio should be transferred,  Windows see the external monitor as the main audio device.

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