Must tweak preferences on startup to get sound. Why?

When I start up my Mac Pro I can't get any sound. First I must open the system preference and set the sound output preference. Then there is no problem getting sound until I next boot up the computer, when the same problem reoccurs. Is there a way to fix this? It is a bother!

What is it exactly in the Sound preference pane that you need to set/change?
And when you do reboot, has the setting changed to what you had it set to when it was working fine?

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