Why is my mesh black when rendering? I added a mesh and made into a ceiling, in Blender. I applied some color to it, but when I render, the mesh is just black; the other objects are fine and have color. How do I fix this? I tried deleting it and inserting it again or copy-pasting the other objects but it still turns black.
you have area lights (with a really small size?) upon your ceiling, pointing downward.

Your ceiling is in it's own shadow! I didn't use BI for a long time, so i don't even understand that you have your walls visible...
Anyway, add some point lights under the ceiling or some area with low energy pointing up.