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I have a light source, but it renders black
Can anyone see what the problem is?
The error on your file is that you set film exposure to 0, making everything... black. It's like taking a photograph with the lights off (or with the lens cap on).
Set it back to one!
Something must be wrong with your scene properties. I appended (Shift F1) all the objects into a new file and it rendered just fine, although it didn't copy your compositing setup.