This is a common problem with laptops due to the multi-GPU power saving setup most laptops have, we have a thread at https://obsproject.com/forum/threads/laptop

This is a common problem with laptops due to the multi-GPU power saving setup most laptops have, we have a thread at https://obsproject.com/forum/threads/laptop-black-screen-when-capturing-read-here-first.5965/ https://obsproject.com/forum/threads/laptop-black-screen-whe... which explains how to fix it.