Only suggestion I can make is for you to (manually) download and install the latest Intel HD Graphics driver package for your NUC (available here: Download Intel® HD Graphics Driver for Windows 7*, 8.1*, and Windows® 10 for Intel® NUC Kit NUC6i7KYK)...
Hope this helps,
Thank you for your reply but that won't work. I usually install drivers manually but as I said the problem occurs even if no os is installed so my best guess it's a bios issue. Anyway I think I can live with it and maybe future releases of bios will fix it. Anyway thank you for your answer.
This message was posted on behalf of Intel Corporation
I understand digital video/audio ports are power sensitive, the port carries low DC voltage while connected to the computer. If you plug and unplug the cable, it may damage the port or the device.
Please check the following URL for additional information. I understand you have display port but bear in mind this is a digital connection.
Ok will keep that in mind. Thank you