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This problem which appears while running

roslaunch openni_launch openni.launch

Can have following two reasons as I know ....

Kinect power supply is not connected properly (LED at kinect may be blinking but kinect not getting power supply of 12V DC for operation which comes either from 12V AC to DC adapter or from robot base). This is the problem which normally happens. Please check the power supply.
The USB of Kinect is not detected by the notebook. This is something that rarely happens.

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