Here is a really good documentary on the history of house music, NOT TECHNO, but the real origins of real house music.
Pump Up The Volume is a 2001 documentary directed and produced by Carl Hindmarch from the UK. A companion book was written by Sean Bidder.
Pump Up The Volume tells the story of the social and cultural explosion that was House. From its roots in Chicago, where it rose from the ashes of Disco, House music became the soundtrack to every fashion show, after–show party, premiere, and club opening around the world. Today, House is used by leading mainstream music stars, from Madonna to U2, to break into new markets and to update their sound. In fact, House has influenced more artists than any style since rock ‘n’ roll. Pump Up The Volume follows the story from Chicago and New York to Britain, interviewing key players on both sides of the Atlantic. It also considers the social impact of House—a sound that has transcended class, race, and cultural boundaries to become the soundtrack of modern popular culture. Check it out.
Here is another documentary that picks up where the first one leaves off. From Jack To Juke, 25 Years Of Ghetto House.