I am a bit of a noob at blender. I have an Obj file and a Mtl file, which Windows' default model viewer can put the two together with no issue, so I know they're linked. When I import the Obj file, they both import in the list, but the model appears black with 0 light source, and white with one. I've tried fiddling with the diffuse, but no avail. The block-white colour does change if I change the light source. I've done my best to try and sort the issue by looking at the forums, but now I've come unstuck despite my best efforts.