Q: My car will not start - 2001 Nissan Sentra

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I installed a used engine with 70,000 miles on it. The car started and ran fine I installed a new battery. I parked car to do other repairs when I tried to start it, it would not turn over I tried to jump it no luck I disconnected the starter from the harness and used a switch hooked up to starter solenoid to start car, the engine turned over but did not start I hooked the starter back up to the harness and it did not start or turn over when I turned the key, it gave me the same whrring sound. What could be my problem

My car has 200000 miles.
My car has an automatic transmission.

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