Note that the cable on which the monitor receives the image signal from the graphics card (VGA or DVI) not contain conductors for supplying audio signals. To do this, use a separate thin cord. It can be built into the monitor, but more often it is removable.
Before making any connections, power off both your computer and monitor. If the audio cable is built-in, just connect it to the green socket of the sound card. If he is separate, look for it in the package monitor. While the last one socket standard Jack, the same size on the sound card, the cord must be equipped with two identical plugs. One of them (no matter what) connect to the sound card as described above and second to the monitor socket Audio In. If the monitor has two RCA connector, connect the red plug of the cord with a socket of the same color on the monitor, perform the same operation with the white plug and the green plug to the sound card.
When purchasing a monitor, used, cord supplied may not be. Then it should be collected. If it needs to have both sides of the plug Jack, just connect the cable to the desired length of the same name, the contacts of the two plugs. If on the one hand should be one plug-type Jack, and with another - two RCA, General wire all the plugs connect together the middle contact of the plug Jack plug to the signal contact of the white RCA plug, and the distant to the signal contact of the red RCA plug.
Turning on the monitor and computer, make sure now the speakers sound. If not, adjust the volume on the software mixer of your computer (its name depends on OS) and a controller or Volume buttons on the monitor. If necessary, display the monitor mode, Mute. If its a separate front panel socket Jack, you can include the headphones, with built-in speakers will be turned off.