So folks, don't forget to check if your Ikea chair is compatible with your screen. I'm not kidding. A thread 
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I've had the problem with my new screen for several weeks now, that every now and then the screen goes black for a few seconds.
Today I had enough and wanted to investigate the problem. So I started changing all the cables, plugging the screen into a different socket, and and and. Nothing helped.
@haeckerfelix this is like a much more absurd version of the time i noticed my old phone was blinking infrared light all over the place for no reason and the remote sensor for my preamp from the 80s would catch it and turn on and off