Check what hardware the machine is not in the Control Panel?
Users questions: 4 chassis front left side from top to bottom is the headphone jack took a microphone USB2USB1 readily able to insert in MP3 headphones or through speakers but the sound is coming out how to do to spread
Experts answer: from the headset jack on the side panel you may not connected to the sound card's output, that is, whether you change even , That your headphone jack on the side panel are not sound, it should be there in the chassis side panel jack extension cable, plug into the sound card's audio output. Also, if you are a multi-channel sound card, check the sound card application there are no other channels will be closed.