Two of the largest tech companies in the U.S. fired their CEOs in September. Leo Apotheker of Hewlett-Packard and Carol Bartz of Yahoo are out, but Apple also had a CEO who didn't last too long at the top. Steve Jobs hadn't been Apple CEO for a decade when Gil Amelio took over in February of 1996. Start the slideshow for a peek at the top 10 list of shortest and longest serving CEOs of U.S. tech companies. The first five are the shortest serving CEO's in ascending order, then the Longest in the same way.