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This might be a stupid suggestion - but the Kinect needs power (12v) either from a Wall Wart or an external 12v supply. The Kinect will look like it is powered up because the USB puts out 5v and will let some of the LEDs light up. Some Kinect cables have a power good LED on the Cable. If it isn't lit - there's the issue.

So make sure it is plugged in and getting 12v. I spent a week trying to figure this out on a Turtlebot, not realizing that on a Turtlebot, the Kinect gets it power from the create's battery, not the USB. (The suspicious unconnected cable should have given me a clue, but it didn't!)