And now, two bits worth of Borrill wisdom:
1. Computers are fascinating because they are the first and probably only machine ever devised by man that have an infinite number of states. (To paraphrase the old "infinite number of monkeys" thing: Sit an infinite number of programmers down at a computer and give him a problem to solve. You will get an infinite number of programs, all different, and all producing the same result.)
2. "The Don't Fix It If It Isn't Broke" school of computer maintenance goes as follows: "Never check, clean, calibrate or test anything that has not failed since the last time you didn't check, clean, calibrate or test it."