Strange display issue

Hi everyone.

I have a working dual-monitor setup with a NVIDIA GeForce GTX 760.
Until short my monitors consisted of 1) some AOC 21,5" (1920x1080) monitor and 2) an quite old Acer 22" (1680x1050).
"Until short" means, the second monitor (the Acer) died a couple of days ago and I replaced it with an PB Viseo243D (still had this somewhere in storage).

Now, my issue is: MacOS does not seem to recognize the new monitor but thinks that the Acer is still connected and thus I cannot change the...

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Author: sodom76