Doubt its a broken crank shaft,, Sounds like a electrical and or Injector/fuel related issue.. Does it crank over a few turns and then stop? Or does it just keep turning over until you let off the key? I had a crank sensor go bad and it would turn over 3 or 4 times and then stop. Replaced sensor and she fired right up.. Even if the boots were completly off or the turbo was shot the truck would still start FYI....
didnt see the last line where is said it will no longer start, and i am very well aware of this