Humming noise when motor idling,,,?

Does Mazda use universal or Original parts when replacing? I was told mechanics uses rebuilt parts. At first, the alternator was changed, This makes the second one they replace... How can someone know tell if that was changed to the original or universal? They also changed my idle pulley and power steering pump too. How can (alternator) go wrong again? Could it be rebuilt part or universal ? I had a humming noise and whistle sound when idling and acceleration . Please can someone tell me what machinery can be used to detect a problem without having to change all these parts?Humming noise when motor idling,,,?Read my lines: Do not let them use the rebuilt parts again! I went through three alternators. Luckily they were still under warranty. Taking them off from underneath the car, was not anything fun.Humming noise when motor idling,,,?The whole nine yards from under the hood was changed ( under warranty )before FINDING OUT THE REAL SOURCE... The bearings in the front wheel and bar ...The dealership hires people off the street with no.....working experienc. Car is fix with new parts...took 3 months to fix this problem.

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