My sound keep on muting and everytime i change i go to the system preference its not changing...

need help the sound of my mac air keep on automatically muting and when i go to system preference to change it ( i cant go it as if its freeze)

Perhaps, it is because you did not click the "lock" button the last time you changed something in System Preferences. If I am not wrong, before OS X version 10.6.6, the operating system would just remember if you locked the System Preferences. However, in my opinion, you should bring your MacBook to your Apple Store and get this problem solved.

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    Build Info: Finder_FE-932001003000000~1
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        __DATA 000000010ce55000-000000010cf53000 [ 1016K] rw-/rwx SM=COW /System/Library/CoreServices/Finder.app/Contents/MacOS/Finder
    0   com.apple.finder                                 0x000000010c9a521f 0x10c966000 + 258591
    10  com.apple.finder                               0x000000010c9977b5 0x10c966000 + 202677
    11  com.apple.finder                               0x000000010c988154 0x10c966000 + 139604
    12  com.apple.finder                               0x000000010c987e15 0x10c966000 + 138773
    13  com.apple.finder                               0x000000010c987d35 0x10c966000 + 138549
    14  com.apple.finder                               0x000000010c987cfd 0x10c966000 + 138493
    28  com.apple.finder                               0x000000010c96b960 0x10c966000 + 22880
    1   com.apple.finder                                 0x000000010c98a69d 0x10c966000 + 149149
    2   com.apple.finder                                 0x000000010c98aba7 0x10c966000 + 150439
    3   com.apple.finder                                 0x000000010c9795d2 0x10c966000 + 79314
    4   com.apple.finder                                 0x000000010c98aa0b 0x10c966000 + 150027
    5   com.apple.finder                                 0x000000010c98a952 0x10c966000 + 149842
    6   com.apple.finder                                 0x000000010c98a78a 0x10c966000 + 149386
    7   com.apple.finder                                 0x000000010c979496 0x10c966000 + 78998
    8   com.apple.finder                                 0x000000010c98a548 0x10c966000 + 148808
    9   com.apple.finder                                 0x000000010c98a410 0x10c966000 + 148496
    10  com.apple.finder                               0x000000010c983df6 0x10c966000 + 122358
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    David

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