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PSU139
Wastegates don't cause turbo's to fail. Wastegates are just exactly what their name implies they dump boost when not needed and work like a flapper that is controlled by a solenoid. Solenoid is run by the DME. The ratting is either the solenoid moving back and forth or some play in the linkage close to the closed point on the turbo which is generally the case. The rattle hurts nothing it just is annoying.
If I was you producing no boost I would check to see if a hose or connector has not blown off. Unlikely both turbos have failed unless someone ran the crap out of it with the engine oil cold and in that case you most likely have limited boost from a lazy turbo(s).
How did you measure no boost condition?
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