Why does the sound level from my mac mini not remain constant?

Bought my mac mini within the last 3 months, and am using my flat screen via hdmi cable as the display. I notice that at some points, the sound will dull down...and I will habe to toggle it up. Then without warning, it jumps back up with a little extra now that Ive added volume. I dont remember it doing this for the first month or so, and cant remember if it coinsided with an update or ... what. I notice that sometimes when the sound fades when im watching a movie, if I tap the movie progress bar, the sound will come back to the prior volume. Ive checked all of the system prefs I can think of... It does this with netflix on safari as well as movies songs through itunes... Help !
Chris

One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for action in Safe Mode...
Reboot, test again.

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Bunyip6 wrote:
... so I am assuming it should not need to be reset/
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Babu
<Re-Titled By Host>

Tell us:
OS X version ?
What may have changed prior to the onset of the issue of "... suddenly... not working..." and " ... preferences ... jumping from ..." ? Software added, upgraded, updated?
what precidely do you mean by " ... preferences ... jumping from ..." ?
ÇÇÇ
EDITadded
I see that your Question has languished for some period of time without response. You have posted your issue in Using Apple Support Communities whose topic is 'How to use this forum software's interface, features and/or how to find what you wish'. It is a relatively low traffic and inappropriate forum for your problem. I will ask our Hosts to move it to " MacBook Pro " where it may get a more rapid response from your fellow users.
endEDIT

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