Black and while movie made on the subject... the "it factor"... what make person charismatic... with magnetism...

There was a TV Series in 2002 called 'The It Factor". I don't think it's what your were thinking of, since it's not black and white, nor is it a movie. The title matches, however, so I thought I'd post it for your consideration.

http://en.wikipedia.org/wiki/The_It_Factor
http://www.imdb.com/title/tt0307762/