Bmw 330i don't start it turn on but dose not crank at all.

You need to make sure your battery is fully charged and it holds that charge. Check your ignition fuse. Check the wires to the battery and make sure there is no damage. Make sure the terminals are clean. Your battery may not be holding a charge. It may be the alternator killing the battery. Inspect the wires that go to the battery to the starter. It may be the starter or starter solenoid. You can check each part by testing the current in the wires, going and leaving the part. If you have a question, let me know. I am here to help in anyway I can.