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This sounds odd as the 5D MK II is a great camera that can handle a variety of lighting conditions and there are a number of possibilities it could be. It's hard to tell from what you've outlined in your message above the exact problem.
It may be that you set your camera to something without realising. First check you haven't knocked the exposure compensation setting down to underexpose the scene. If it's not this you could try reseting your camera to the manufacturer default settings. You can find this in the main menu. If this doesn't work then it could be that the camera is faulty or the lens?
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