Laptop Win10 Pro x64 w/ Intel HD4k + NVIDIA screen cap blank screen FYI

[BloomingAzaleas]

THIS IS AN FYI
OB Studio 17.0.0 x64 for Win x64, OBS downloaded 13 Jan 2017
Installed Win10 Direct3D is version 12.
Intel HD 4000 + NVIDIA GEforce 650M display adapters, latest drivers each. NVIDIA set as the preferred PhysX processor.

Using 2 external Dell displays & adding a Display Capture video source with mostly default Profile settings gave blank screens both displays.

See this older goodie first: https://obsproject.com/forum/threads/laptop-black-screen-when-capturing-read-here-first.5965/

After much fiddling around discovered by accident in Profile Settings:
Advanced->Video:Renderer defaults to 'Direct3D 11'

For grins changed this to 'OpenGL' and BANG! - display capture came alive. Cannot say anything about perf with OpenGL but at least get functionality.

 

[Harold]

In order to display capture properly on switchable graphics laptops, OBS needs to run on the intel and not the geforce.

 

[Fenrir]

Using the OpenGL renderer on windows is STRONGLY discouraged as you will definitely have reduced performance and can run into issues with certain games. This is not a solution, and I'm skeptical that it actually made any difference for display capture's ability to hook into a monitor. The thread you already linked is the correct solution. Yes, the thread is fairly old, but the solution has not changed so there hasn't been a need to update.