Hi,
I literally just signed up right now, because this problem is irking me. It seems I was messing around with cycles and hit something, or haven’t hit something and I get a pure black render. My preview render looks fine, but the final render is just pure black. Here’s a few images to help. Also, the console gets an error: "Shader Graph connect: can only connect closure to closure.
What do I do? What does this mean? How do I fix it? Here’s the blend file http://www.pasteall.org/blend/14651
Delete all materials you have on gun. Open Node editor window an see what’s there - looks like material error, nothing connected to output node.
Just a guess.
thanks for the idea man, but that didn’t seem to do it. I think I had done that before. See it’s weird cause the preview is rendering the final image normally. I think it has to do with scene settings, or something I hit. I don’t know 
There are too many variables to give you a sensible solution from just a couple of screenshots that don’t show the useful infomation.
Please always attach your blend file or post to http://www.pasteall.org/blend/ so you don’t waste the time of other users as they have to best guess what may be the solution to your problem.
Delete the overide material set in the render settings (select it, press delete key then enter key)
You good sir Richard Marklew are a boss. I knew it was something I had accidently tinkered with and forgot about! Thank you! I changed my background to white and noticed the gun rendered transparently but I didn’t know why. Thank you again! Carry on.
