Ford Mustang 2004 car won't start after battery terminal changed?

Had my battery in my 2004 ford Mustang changed. The terminal broke and was a little loose, but the car still ran. Today we changed the terminal to the battery and now the car won't start. Every thing was fine earlier with the loose terminal, but when the terminal was changed, the car decides not to start.

Not start? Does it turn over (crank ok) just not fire up?

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