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if you are getting a humming when you turn the key, chances are your starter pinion gear can't fully extend. There is a safety switch in the starter motor that wont let it crank until the pinion is extended, engaging with the flywheel. The starter motor may be loose or not mounted so that it allows the pinion to clear. You might try turning the crankshaft pulley with a socket wrench a few turns, and try it again.
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