What would stop engine from turning over after being driven without a thermostat

What is your question?

Was having an issue with engine overheating and stalling out. Changed thermostat twice didn't solve issue. Decided to drive it without one. Ran fine no issue when I got home and turned off the engine it has not started since.l think it could be cam and crankshaft position sensors. It tries to start now

What makes this problem better or worse?

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How long has your 1999 Buick Regal had this problem?

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