I tried also the Displayport.
Same problem -.-
In this case what I would recommend is to install the driver that appears on the following link Intel® Download Center. It needs be installed by extracting the zip file and running the setup.exe file or by using the manual installation(through the Device Manager) method to install.
If the driver does not work could you please let us know what type(brand) of HDMI cables you're using, is it a high speed HDMI cable?
Can you check if you have the latest BIOS version and the latest graphics version, here are the links in case you don't have them, Intel® Download Center (3rd option), Intel® Download Center (2nd option). I would also recommend checking if you have the latest firmware version for your Denon AVR-X4100W installed.
Let me know your findings.