New 27 inch screeching noise, hooked up to a fire wire soundcard?

so my sound card and speakers and cables and power board have been tested on other mac.s in the same and different location.
the only way i can reproduce the issiu is with this 1 comp
i took it to a an authorised apple repair. they replaced the logic board but couldn't solve the issue.
please help

could be, try powering down the mac, with the exmonitor connected and see if it is recognized

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