I recently purchased a Predator X27 (UM.HX0AA.004). I plugged both the HDMI and the DP. DP seems to be working well, but when I change to HDMI, I keep getting an error message. The screen is black and it says ''no signal''. I tried rebooting the computer and plugging the cable again but it doesn't seems to work. I checked if I had the right cable and it seemed ok. I joined pictures of the way the cables are currently plugged in. (monitor, computer, close-up of the computer)
A note on the first picture : there isn't any plug to the left of the HDMI. The picture was taken in an angle because of the stand. Last wire is the power, not the headphone.
I also have another question. The user guide says the monitor support DDC, but I have no idea where to plug that cable on the monitor. On the computer, I have to put it in the graphic card (visible below and between the two cables on the last picture).