Need help rendering textures

Hello! I am new to Blender, and have started making a relatively simple model

and, following Andrew Price’s tips, textured it with a Normal, Color, Occulusion, Specularity, and Displacement map.

However, my problen is that when I render it in Cycles, it renders as black for the corner pillars (that I textured).

How can I fix this

Have you UV unwrapped your object. Have you checked normals (recalculate). Have you asked on the Blenderguru website, since I don’t know exactly which tut you are doing.