A 730 HDMI-input - I am completely frustrated

I bought a new Thinkpad A 730. Wanted to use it also as a second mionitor for my laptop via HDMI-input. If I plug the source to HDMI, there is a humming within the speakers.
This occurs in all cases, if the PC ist ON or OFF, I tried also different sources to plug into HDMI-in. It also hums if there is nothing plugged and if I only choose the source on the monitor.
The first MEDION-service made a software reset! Great!
The second MEDION-service made a stress test and said the noise is within the specification.
The third service said - there is not problem.
But I cannot use the HDMI input at all!
Lenovo will not take back the A730 and will not solve the problem.
PLEASE HELP!

And the humming is going from the speakers to the headphone if I plug in it.

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