Sony VGC-LT30 Series - Manual (Page 174)

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Troubleshooting
What should I do if I do not hear sound from the built-in speakers?
❑ If you are using a program that has its own volume control, make sure the volume control is properly set. See the
program's help file for more information.
❑ Make sure the speaker volume is turned up loud enough and the audio option is enabled.
❑ The muting button on the wireless keyboard or the remote commander may have been pressed. Press the button once
again.
❑ The volume may have been turned off with the volume down button on the wireless keyboard or the remote commander.
Press the volume up button to turn up the volume loud enough to hear sound.
❑ Check the Windows volume controls by clicking the volume icon on the taskbar.