I recently switched to a monitor (no speakers) from a TV that I use for both PC and cable tv. Since I'm using a monitor now, I use the headphone out port on the monitor to the line in on my PC. The cable box is connected to the monitor via HDMI. I get audio but my problem is that I also get a ground loop buzzing sound at like 60hz and since I use a subwoofer this is really annoying. I noticed the only thing that makes the buzzing sound go away is disconnecting the coax cable from the cable box (which then I can't watch TV). This buzzing noise still occurs even when the cable box power cable has been disconnected. If the coax cable is connected to the cable box I get that humming, as soon as its disconnected the noise goes away. I'm not sure what to do at this point. Is it possible there is a bad coax splitter or cable that could be causing this issue? Does anyone know any workarounds to this issue? Thanks!