Canon 1D MK2 - Every other photo is black? HELP

I recently purchased a Canon 1D Mark II. I had it serviced, picking it up last Monday. Nothing was wrong with the camera. A coworker asked to take photos in the office. He stepped away, returning a few minutes later, asking me if the camera's taking a black frame, every other frame was normal.
At the time, I didn't think much of it. I thought it was user error. However about a hour later, I tried to take some photos and encountered the same problem. Every other photo is black. The photos which do show up, are clear, well balanced and properly exposed.
So far I reset all custom settings on the camera, and make sure noise reduction was disabled. So far no luck.
Does anyone know what's going on?
Thanks so much.

The EXIF data for the black photos is the same as for the properly exposed photos. (Manual mode, 50mm, ISO 100, f/10, 1/200) That leads me to suspect that either your shutter, or your mirror is failing, and not allowing the light to reach the sensor.
I can't think of any other reason for a black photo.
Mike Sowsun
S110, SL1, 5D Mk III

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Canon 1D MK2 - Every other photo is black? HELP

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