Sound being reset

Recently (last couple of months) when I power up my Mac I've noticed that the volume on my sound is at 0 (no sound). I can
reset the volume level with no problem, and it stays fine until I power off the Mac. Once I turn the Mac on again, the sound
volume is reset to 0.
This isn't a major issue, more of an annoyance than anything else.
Any clue as to what is going on? Other than I need to reset the PRAM, that is...

Not a battery problem.  Check this:
Power On Self-Test Beep Definition - Part 2
Look inside, particularly near the dimm slots for any lit diagnostic leds.
Does the power button led have a blinking sequence?

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