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Would you post your log and steps? I don't know how to help you with not enough information...
But I make some note about xtion with ROS in my blog but in Chinese. (click me to blog)
For asus xtion, you need to install openni2.
sudo apt-get install ros-indigo-openni2-camera ros-indigo-openni2-launch
and then do these steps to show image
roscore
roslaunch openni2_launch openni2.launch
rosrun rviz rviz
you may meet some error when rviz open. Just change the "fixed frame" can fix it.