Take out spark plugs, put gearbox in neutral, put a wrench on the cranshaft pulley bolt and try to turn it. If it will not turn, the engine is seized, you have to take the engine out and change many parts, cheaper to buy a used engine. If it does turn take out the starter motor and clean and test it.
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Take out spark plugs, put gearbox in neutral, put a wrench on the cranshaft pulley bolt and try to turn it. If it will not turn, the engine is seized, you have to take the engine out and change many parts, cheaper to buy a used engine. If it does turn take out the starter motor and clean and test it.