i have a laptop .hdmi is going to tv with video feed . mini jack going into channel on the dj mixer. i disable the hdmi audio and enable the mini jack out .if i try to play the music video showing on the tv and the audio going to the dj mixer i get a loud buzz.if i unplug the hdmi im clean but ive lost the video feed. is this a ground loop issue ? if im not playing video and just audio out of the laptop then im fine .its only when the hdmi goes in the laptop to output to the tv to get the video that i get a humm. theres no optical out on the tv ...please help.......TIA