As far as I know, there is not a switch that prevents the engine from turning over. Now when you said you tried to start the car again, I am assuming you filled the motor with coolant again and temp fixed the blown hose just to see if the X runs correct? Because a head gasket is blown, doesn't mean the engine will not turn over unless the pressure loss is so much between the cylinders that there isn't enough compression in 2 cylinders or more. To do a thorough test, you will need to replace the hose, fill the system with coolant, or heck, you could just use straight distilled water for the time being. This way if it does work, you could do a flush at the same time. Anyways, bleed the system fully and then try to start it. If its still a no go, check the easy stuff first and work your way to the harder stuff.

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2011 E70 50i M Sport