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Is it a loud whirling sound? Coming from under the vehicle or the dash area?
The starter on this car has two actions that it performs when you turn the key; first it pushes the starter drive gear outward so that it contacts the flywheel, and then it turns the starter motor, thus turning the engine. If the part of the starter that extends the drive gear has gone bad, the starter will just spin the motor without contacting the flywheel and turning the engine. Does it sound like an electric motor spinning?
I think that portion of your starter has gone out. The starter needs to be replaced. Do you plan to change it your self?
The only other option could be that the flywheel has broken, but that's not very likely and would make a horrible scraping noise.
Ok. Let me know if you need any diagrams or additional info if he decides to do it himself. Thanks!