I went and bought a $60 usb-c to hdmi adaptor to see if that was the problem, but no luck.
Ive tried booting each RAM stick individually to see if there was a faulty one, still no output. Would be be a killer if they are 2400mhz sticks on a 2133mhz motherboard? Im aware they are supposed to downclock to 2133, but maybe this could be the problem?
This thing is driving me crazy.
The NUC may use HDMI-CEC commands to switch you AVR's or TV's inputs where it is NOT connected. This behaviour still causes irritation on some setups. I recommend disabling HDMI-CEC features completely once you can access the BIOS.
Please verify multiple times you are still on correct input!
Just another idea to test if somehow you can get video outta that little box:
- Turn NUC off
- Press and hold Power-Button for ~3s
- Wait ~10s ... it should show the Recovery-Menu in VGA-Mode
Good luck man!