Yes I can confirm the machine thinks there are no monitors connected.
Since you're using a closed source graphics driver we can't investigate
it any further than that. I would only recommend trying:

 * unplugging and reconnecting the cable
 * replacing the cable with a new one
 * avoiding any adapters if you can


** Changed in: nvidia-graphics-drivers-340 (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1943053

Title:
  fernseher wird nach upload nicht mehr erkannt

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