Turning Off Sound along with the LCD Backlight Using the DISPLAY OFF Button
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Turn on your VAIO computer and press the F2 key repeatedly until the VAIO logo disappears.
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Press the or key to select Advanced.
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Press the or key to select Display off button and press the Enter key.
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Press the or key to select Turn off Display and Sound and press the Enter key.
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Press the or key to select Exit, select Exit Setup, and then press the Enter key.
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The muting function of the DISPLAY OFF button overrides the Windows sound settings and disables all the built-in sound input and output devices of your VAIO computer, including the built-in speakers, the headphone jack, the microphone jack, and the built-in microphone. To put the Windows sound settings back in place, press the DISPLAY OFF button once again to restore sound on the computer.