I have a 2006 malibu, it wont start just cranks over.New motor still same thing on 2006 Chevrolet Malibu

I bought it for my little brother and it wouldn't start. Told my a mechanic it was the motor. Installed a new one and still the same thing. The car is still at the mechanic and he is stumped. Any ideas on how to get this car running??? HELP!

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