Q: Why car cranks but wont start after over heating

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Well as i was driving i dindnt notice the bottom coolant hose had fell off till i stoped and seen smoke under my hood and car shuts off ..i filled car back up with proper fluids and noticed milky substance I'm oil ..i changed head gasket myself and still car wont start ..im starting to think catalyst converter ??

My car has 210000 miles.
My car has an automatic transmission.

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