Does not start, recently had crankshaft sensor replaced?

Recently had crankshaft sensor replaced. Car ran fine, then started overheating. This time it overheated completely; and the car shut off. I let cool down for 2 hours would not start back up. Had it scanned it was giving the code for a crank shaft sensor. So replaced crank shaft sensor again, also replaced cam shaft sensor and one other sensor and the relay. Car still won't start. Has a low crank, like a whining crank but will not start.