I change my audií 4 1996 engine and it refuse to crank, old help me out

Hello, What will it do when you try to crank the engine? What did it do before the engine was replaced? One thing I always encourage in this situation is to go through the engine bay with a "fine-toothed comb". There is likely something disconnected, mission, broken, or otherwise not serviceable. If you changed the engine computer as well, you are likely running into immobilizer issues since the key does not match the engine control module. How did you source the engine? Is it new, used, guaranteed working? Provide as many details as you can, and I will try to get you in the right direction.