Sorry folks I should of mentioned this from the start. I'm actually using the monitor with a Win7 PC and I'm quite familiar with Windows and I got all of my other sound devices disabled with only the LG display enabled. I also checked the monitor itself to see if maybe it was on mute and its not so clearly the settings in the monitor is fine and I'm out of ideas as to what else could be the issue here. The only sound the monitor makes is a soft beep sound when it wakes. Have any of you used it with a PC and have any ideas as to what could be my problem? Or maybe it is in fact a defected unit?