Question Laptop feedback from TV connection

May 11, 2019
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So heres the problem. I have setup my laptop to a mixer via the headphone output. That to an amp with mic connection etc. Connected my TV via hdmi to the laptop for kareoke or visual effects. The moment the hdmi connection touches the laptop hdmi input I get a loud humming feedback noise through the speakers. What I've tried - new hdmi cables, different TV, VGA adapter to hdmi, diff laptop using vga, diff plug outlets via extension leads, updated audio drivers, disabled laptop mic, disconnected earth in TV to see if it's a ground loop, connected my phone to the audio equipment no buzzing. Can play perfect through audio equipment until the hdmi or VGA are connected to laptop
I'm running out of ideas and Google searches.
 
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