My car won't start with a new battery?

My car won't start with a new battery?

Added (1). I recently purchased a 2002 ford Taurus in September. A few days after getting the car it wouldn't start so I replaced the battery and it has been running fine for the past month and a half. Today I as I left work I turned on the car but as soon as I turned the headlights on the whole thing died. When I had it replaced the autozone guys checked my alternator and said it was running fine. The belt in the car is needing to be replaced could that have anything to do with the alternator not charging

A few notes to get started:

1: What does it DO?! I can't diagnose a car without knowing the problem.
2: What is the year, make and model of your vehicle?! Since I can't diagnose it without this info.

It's possible that the new battery is not charged. It's possible that the cable connectors on the battery are dirty or not tight. It's also possible that your starter or solenoid is bad. What have you checked so far

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