LG Electronics 23LC1R* The audio function does not work., There is a problem in PC mode. (Only PC mode applied)

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Troubleshooting Checklist
The audio function does not work.
Picture OK &
No sound
•Press the VOL (or Volume)button.
•Sound muted? Press MUTE button.
•Try another channel. The problem may be with the broadcast.
•Are the audio cables installed properly?
Unusual sound
from inside the
product
•A change in ambient humidity or temperature may result in an
unusual noise when the product is turned on or off and does not
indicate a fault with the product.
No output from
one of the
speakers
•Adjust Balance in menu option.
Screen color is
unstable or
single color
•Check the signal cable.
•Reinstall the PC video card.
The signal is out
of range.
There is a problem in PC mode.
(Only PC mode applied)
•Adjust resolution, horizontal frequency, or vertical frequency.
•Check the input source.
Vertical bar or
stripe on
background &
Horizontal Noise
& Incorrect
position
•Work the Auto configure or adjust clock, phase, or H/V position. (option)