Well if the starter is humming, that means its spinning (which it should do) but the gear isnt shooting out and grabbing onto the flywheel (which it needs to do).
Thats a common way that starters sometimes fail. You'll need to buy another... you can try getting one from a salvage yard to keep it cheap or call Suncoast Porsche, they are usually really good on prices when compared to other dealers.
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