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Feedback when HDMI and audio connected

HP Pavilion 15
Microsoft Windows 10 (64-bit)

I wish to connect the HDMI to a video projector and the audio port to a sound mixing desk. Either audio or video works fine alone but when both cables connected am getting high-pitched feedback into the sound system. I have tried disabling HDMI as an audio device but it makes no difference. Have tried more than one HDMI and audio cable - same result.

 

 

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