How can I fix my terrain

Since i’m using my new computer I have this problem, my terrain consists of black lines in the “scene” window but seems textured in the “game” tab. I never had this on my old computer, does anyone know how to fix this?

The black lines are because your scene shading mode (under the scene tab - top left) is set to “wireframe”. if you set it to “shaded” it will probably look like you want it to.