Upgrade to snow leopard, no audio is muted on macbook pro!

Upgraded to snow leopard at work on my macbok pro (non unibody), did the 10.6.2 update. When i took my laptop home, realized that my audio is muted. After some googling, followed others posts and deleted 2 pref files within "Prefs > audio", rebooted, and same ol'.
When i returned to work today, audio worked fine. Now, i'm home again, and audio is muted! Power source plugged in, in both cases, but run wireless at home. (wasn't connected yet when i has problem 2nd time).
Any ideas?!
John

HI John and Welcome to Apple Discussions...
Try Resetting the PRAM
Carolyn

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    com.apple.driver.AppleHWSensor    1.9.3d0
    com.apple.filesystems.autofs    2.1.0
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    com.apple.kext.AppleSMCLMU    1.5.2d10
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    com.apple.driver.AppleIRController    303.8
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    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
    com.apple.iokit.SCSITaskUserClient    2.6.8
    com.apple.iokit.IOAHCIBlockStorage    1.6.4
    com.apple.driver.AppleUSBHub    4.2.4
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    com.apple.driver.AppleAHCIPort    2.1.7
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    If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
    Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

  • Install Snow Leopard from CD that came with MacBook Pro to different Mac

    I need to re-install Snow Leopard on an older MacBook of mine I want to clean out for my wife.
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    Sorry for the wordy post and thanks in advance for any help.

    R C-R wrote:
    Deviros wrote:
    From what i can tell, the media contains only the necessary files to install to that model-specific hardware.
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    Perhaps it's just older models that allowed it?
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  • Install Snow Leopard over brand new Lion based MacBook Pro

    Dear Forum.
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    With love from Denmark, Thanks everyone for reading this

    so it won´t be able to install 10.6.8 no matter how sofisticated changes are made??
    Read here > Don't install a version of Mac OS X earlier than what came with your Mac

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    Glad you still have the box, ellory!
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    Cheers
    Rod

  • Install Snow Leopard on new partition (on new MacBook Pro)

    I need to install OS X 10.6 on my new MacBook (10.8.2) because older programs won't work on my new machines.
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    (111896)

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