If the NUC enters the “A bootable device has not been detected” screen you have no bootable system installed.
Do this:
- Turn of the computer.
- Put a bootable USB-drive, for example a Lunix image or the ROCK image, into one USB-slot.
- Turn on the computer and press F10 during boot screen to enter the boot menu to be able to see bootable devices.
- Choose the USB-drive with the bootable image on it.
- Follow the instructions and install the OS on the m.2 drive.
- Now will the computer recognise the m.2 as a bootable device and start the OS.
Good luck!