2 things. Could be the starter solenoid but it should be open or closed and I dont think it be a whining sound. Also, it sounds like the starter might be turning but not engaging. Could be teeth missing form the flywheel or the gear on the starter is not getting "thrown out" away from its stopped (retracted)position.
A simple ex. here:When you turn the ignition switch, the starter motor is energized, and the electromagnet inside the body engages. This pushes out a rod to which the pinion gear is attached. The gear meets the flywheel, and the starter turns.
So the starter may be turning but the pinion gear might not be always extending.
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SIKSUKR
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