On the American television sitcom Happy Days, one of the Fonz's signature moves was to pound the jukebox to make it work. According to Mack Blakely, executive director of the National Electronics Service Dealers Association, in the old days, devices had a lot of mechanical stuff in them, and you could jar something back in place.
That logic still holds with today's machines. A good smack can temporarily fix an intermittent connection, but it's risky. Whacking a platter-based hard drive could damage the head. A few well-placed taps may identify a weak connection on a printed circuit board.
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