No, I didn’t test with second monitor. But the monitor
works normally with 3 different computers in my house via the same HDMI port so
it is unlikely the monitor is the problem.
The mini HDMI cable is brand new and has only been
plugged in once. But theoretical the cable can have a fault (picture and
sound is perfect – the only problem is that the monitor will not shut down/sleep when
the NUC is shut down/sleep).
OK, I have now ordered another mini HDMI to HDMI cable
and a mini DisplayPort to DisplayPort cable so we have to see what it brings.
It will take a few days to get it.