Q: turn over but ,won't crank up on 1998 BMW 328is

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
put another engien in it ,drove it for about a week ,now it turn over but won't crank up.what can cause this to happen?
(1) Answer
Many, many things i.e fuel pump, crank sensor, out of gas etc, etc.
Really need to have the car diagnosed properly.

here are some shops:
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