Render problem

[www.TechRoom.bg]

Hello,
I have an issue when try to render project model.
Project have more than 17 mln elements. He's separate in different files. I have an arhitecture, hvac,wss,fire protection,electric and structure files.
When I render files separated 1 by 1 all its just perfect. When I join files (link all files in one) render result is black screen. When I try render with architecture and wss result I perfect. Problem with this black render result start when I try to render more that 2 linked files in arhitecture file.
If some have solution on mind or idea how to fix the problem please share it.

[L.Maas]

Ok you have some troubleshooting to do. I would try to optimize my files for rendering. Start of with duplicating your files for rendering.

Determine what you want to render overview or details?

Some possible troubleshooting steps:

-Checked that nothing is blocking your view?

-You mention linking  more than 2 files. Does it matter which 2 files you link? 

-Memory/Processor issues (maxed out)?

-Lighting settings are set correctly

-Check/Change other Render settings.

-Create new render view.

-Switch off stuff that does not need to be in the render.

-Use bounding box in your camera view to limit what will be part of the render. 

-If needed, delete stuff from the project.

-Copy things to a single ore limited amount of projects (avoiding or less links).

-Try a different computer.