I have a 1995 Buick Century and it won't crank. When I turn the key the lights come on but it makes no sound as if its trying to turn over. Do you think something may have become loose if so where do I begin looking?

What if both the battery and the starter are new?

1st check your battery cables to make sure that they are not corroded with acid, if they are , then clean them with a solution of baking soda and water, take a brush and scrub them, then rinse them of, and make sure they are tight, if it still doesn't start, then have someone check your battery out to see if it has a dead cell in it, if the battery checks out ok, then i would suspect the starter.