My car was parked near one of the hardest hit hurricane Sandy sights but on high ground. It ran fine for 2 days but i did have to drive through some deep water when leaving (nothing too deep that water entered the car). The car started to turn over this morning then stopped. All I get now is what sounds like a fan. I'm guessing its the started spinning but not engaging? Is it possible the computer was damaged driving through the waters?

 

The computer is inside the passenger compartment. Even if it fails, the engine would still crank and sound like it is trying to start.

If the water didn't come up past the bottom of the engine (about the center of the wheels), it should not have flooded anything important. Perhaps the problem now is not flood-related.

(Driving into flood water is of course foolish and dangerous. You never know how deep it is, or if the road even still exists underneath.)