Output Volume On and Off Auto & sometime LOCKED!!!

Hi,
Facing a very strange problem...sometime i might not able to control the volume of MacBook Pro from the keyboard or even from the sound setting (in the system preferences), cause, it shown as LOCKED!!!
2ndly, Sometime when i'm watching movie and doing music work, the output volume will On and Off automatically, i'm sure, i do nothing on the volume control and even the volume control from the keyboard as well...
However i restart and configure from the system preferences...it can't Fixed!!!
What's the problem and what's your opinion?
Thanks and appreciate!!!

Hi,
Try resetting the PRAM and NVRAM
Also, please add your Mac OS X version to your profile. Thanks. Click "My Settings" on the right side of this page.
Carolyn

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Output Volume On and Off Auto & sometime LOCKED!!!

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