LG 24BR650B-C 23.8" Monitor - Manual (Page 27)

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Do you see an "unrecognized monitor, plug and play (VESa DDC) monitor found" message?
Have you installed the display driver? • Be sure to install the display driver from our web site: http://www.lg.com .
• Make sure to check if the graphics card supports Plug and Play function.
No sound from the headphone port.
are images displayed without sound? • Make sure that the headphone port connections are made properly.
• Try increasing the volume with the ► button.
• set the audio output of the PC to the monitor you are using. (The settings may differ depending on the operating system (Os) you use.)