Any improvised method of removing ground loop noise (it's a hum on speakers/headphones). I've recently switched to a noise cancelling headphones and I've noticed it has gone louder especially if my foot touches the ground.
However, if I touch the case with my feet off the ground, the sound is disappears. Do you have recommendations or workarounds how to get rid of this? A 3-pronged power cord is out of the question since the outlets are not ground-configured.