Oculus DK2 recognized bur getting a black screen in VR preview

Hi all. I just started using VR on my laptop but been facing some issues.

UE version: 4.10.4
Graphics card: Nvidia GTX 950M
Driver version: (latest update)
Oculus runtime version:

First of all Im not using the latest Oculus runtime cause of compatibility issues with my graphics card. The demo scene runs quite ok with my Oculus and the option for VR preview in UE is active but as soon as I run it, I am getting a black screen in my HMD.

Tried 0.7 and 0.6 but with no luck as well as downgrading my nvidia driver

Any advice on how I could manage to fix that?
Thank you in advance.