Mini Displayport doesn't work :(

Hi all,
I'm a newbie, so I'm asking for your help guys.
I've recently bought a new laptop and installed kali rolling on it.
I've had to install graphics driver for my NVIDIA GTX 960M to run GUI at all.
But after a few days of work i recognised that my Displayport doesn't work :(
My HDMI and VGA is all right, but the Displayport is looking like it's dead.
Every time I plug in a cable there aren't any changes in "xrandr" command- it says that the DP is disconnected.
I've tried multiple tutorials about "How to install graphics card drivers" but every time it just gave me a blank screen saying "Oh no! Something has gone wrong."
I don't know what to do... Please help me...


I installed the driver this way orginally:
http://docs.kali.org/general-use/ins...-on-kali-linux

My laptop model is:
Laptop Dream Machines G960 (G960 i5-15PL08)
15.6'' FHDmatt IPS LED/i5/8GB/500GB_SSD/HD530+GTX 960M_2GB/USB3/HDMI/mDP/BT/6cell

If you'd like to have some more info please let me know what to add.
I really need this port, please guys help me!!!

Run

Code:

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sudo apt-cache clean && sudo apt-get update && sudo apt-get dist-upgrade
apt-get install -y linux-headers-$(uname -r)
apt-get install nvidia-kernel-dkms

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It just gave me an error balnk screen again after rebooting :(

Does it happen after installing Nvidia drivers or Nvidia drivers don't install at all? It can be fixed if you are facing black screen after installing Nvidia drivers.

I said that i can install drivers as it was shown in kali's official tutorial. But my displayport still doesn't work.
Does it mean that my nvidia drivers are bad or is it something else?
I thought it is drivers fault but only this one port doesn't work.