Pull off the intake hose to the turbo and check to see if there is any shaft movement. Push in and pull on the impeller blades. If it moves then it is bad. Also move it side to side. If it moves a lot the it is bad. Also start the car and then look at the impeller blades. See if they are moving.
Here is a video of the death whine
http://video.google.com/videoplay?do...39221222&hl=en