I am getting noise in my studio monitors that are plugged into my PC. It is a scratchy sound that generally occurs when there is activity, such as scrolling through a web page, downloading files, or opening programs. It does not increase based on computer volume or go away when I mute the output. It does increase or decrease depending on the input sensitivity of my active monitors. I feel like I isolated the interference to ground noise on the PC. I kept the speakers where they were and plugged it into a laptop and there is no noise. If I just touch the tip of the speaker jack to the i/o backplate for the PC motherboard, I get noise. The noise is the same intensity no matter where or how I plug into the PC. As long as the audio physically connects to the PC, whether over line-out, USB DAC, or HDMI, I get the same noise. I've tried plugging the speakers and PC into the same or different outlets and there is no effect. I was thinking of asking this in a computer forum, but I feel like this is, at heart, a grounding issue that I feel many of you have probably tackled during recording or live sound. Has anyone had a similar issue and/or would know of a way to fix it? Thanks in advance.