I use line out sound but the sound does not stay on when I start up

I use external speakers with my Mac Pro.  However, since I upgraded to Yosemite (with latest upgrades), I have to use the desktop icon to turn on the sound every day.  Alternately, I can uncheck the mute box in Preferences.  Somehow, the mute button is set when I start up.  How can I keep the mute button off?

How long do you wait for the display to come up?  Can take several seconds during the boot process.  Have you tried a safe mode start by holding the shift key down during startup? 

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