What should I do if there is no sound from the connected audio system?
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Make sure an audio system has been connected to your VAIO computer properly.
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Use HDMI Settings / HDMI Setup to activate the “Control for HDMI” function, when you use the HDMI connection.
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Set Speakers to Audio System in the Sound Adjustments / Sound setting.
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Check the settings and the compatibility of the audio signal from the connected audio system.