TS3742: OS X: About kernel panics

Learn about OS X: About kernel panics
rona11
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Q: there is no audio after a kernel panic, how do i fix it??

I had a kernel panic few days ago, and there's no audio on youtube, itunes after the attack...... i just realized it was a kernel panic after googling for solutions...... how do I fix it??? i just bought my macbook pro few months ago

MacBook Pro (13-inch Late 2011), Mac OS X (10.7.3)

Posted on Apr 10, 2012 3:44 AM

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rona11

Q: there is no audio after a kernel panic, how do i fix it??

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  • by fane_j,

    fane_j fane_j Apr 10, 2012 12:35 PM in response to rona11
    Level 4 (3,667 points)
    Apr 10, 2012 12:35 PM in response to rona11

    What was the cause of the KP?

  • by rona11,

    rona11 rona11 Apr 10, 2012 9:42 PM in response to fane_j
    Level 1 (0 points)
    Apr 10, 2012 9:42 PM in response to fane_j

    Not sure what causes it.... I had it when i turned on the macbook .....any idea how to get back the sounds? Thankss

  • by X423424X,

    X423424X X423424X Apr 10, 2012 9:52 PM in response to rona11
    Level 6 (14,237 points)
    Apr 10, 2012 9:52 PM in response to rona11

    When in doubt, smc and pram reset.  May not work but always worth a try.

     

    Boot from your recovery partition to repair/verify the drives.

  • by rona11,

    rona11 rona11 Apr 10, 2012 11:49 PM in response to X423424X
    Level 1 (0 points)
    Apr 10, 2012 11:49 PM in response to X423424X

    How do i do that? Sorry, i am not so good with the pc....and i am still new with the mac thing....please advise, thankssss

  • by X423424X,

    X423424X X423424X Apr 11, 2012 12:17 AM in response to rona11
    Level 6 (14,237 points)
    Apr 11, 2012 12:17 AM in response to rona11

    The blue lettering are live links to how to do that.

  • by rona11,

    rona11 rona11 Apr 11, 2012 3:13 AM in response to X423424X
    Level 1 (0 points)
    Apr 11, 2012 3:13 AM in response to X423424X

    Should i proceed with the resetting if the macbook is functioning ok except for the audio sound problem? It no longer freezes and i can operate as usual......will the smc etc help with the audio issue?

     

    Thanks

  • by rona11,

    rona11 rona11 Apr 11, 2012 3:30 AM in response to X423424X
    Level 1 (0 points)
    Apr 11, 2012 3:30 AM in response to X423424X

    I have tried both smc and pram but there is still no audio and youtube will download so slowly with no sounds...

  • by rona11,

    rona11 rona11 Apr 11, 2012 6:23 AM in response to X423424X
    Level 1 (0 points)
    Apr 11, 2012 6:23 AM in response to X423424X

    or do i need to a lion recovery disk assistant to reinstall the lion software so that i can get the audio back?

     

    Please advise, thanks load

  • by X423424X,

    X423424X X423424X Apr 11, 2012 1:01 PM in response to rona11
    Level 6 (14,237 points)
    Apr 11, 2012 1:01 PM in response to rona11

    Some ideas and suggestions:

     

    Have you checked the sound preferences to make sure you have chosen the correct output device and the output volume is set and not muted (checkbox on the right of the output volume)?

     

    In Sound preferences, click Sound Effects and then click a sound in the sound alert choices.  Do you hear the sound from that?

     

    Try setting up another account (Accounts preferences) and see if you have sound in that account.

     

    Try booting in safe mode and see if there is sound that way.

     

    Your machine is still under applecare so consider taking it to apple to look at.

     

    My philosophy on reinstalling the OS:

    I generally never advise reinstalling the OS unless someone really damages their OS.  That's because I always think the problem can be solved other ways and also if you simply replace the OS while keeping all data intact I don't think it will solve the problem.  And if you wipe the disk and do a clean install, yes, that may solve the problem but it's then a lot of work to get back where you were having to reinstall everything.  This is why it is always recommenced to have backups of your system.

  • by rona11,

    rona11 rona11 Apr 14, 2012 6:32 AM in response to X423424X
    Level 1 (0 points)
    Apr 14, 2012 6:32 AM in response to X423424X

    I have checked the sounds pref..... no output device found and no sound effects can be heard......and when i press the volume button, there is a circle on it (like the no entry sign) ......hence there is no volume at all......any idea?

  • by fane_j,

    fane_j fane_j Apr 14, 2012 2:03 PM in response to rona11
    Level 4 (3,667 points)
    Apr 14, 2012 2:03 PM in response to rona11

    A kernel panic may be caused by a hardware issue. Followed by what you describe, it suggests the failure of a component of the audio subsystem.

     

    Do you hear the Mac's initial chime upon startup?

     

    Have you checked the audio section in System Profiler's Hardware section?

     

    Did you try a pair of headphones, or a USB speaker?

     

    If you are sure you did reset the SMC and NVRAM, as suggested by X423424X, to no effect, and the above are negative, then you should boot from the Install DVD (or Lion recovery partition—although, if you're using Lion, you're in the wrong forum). If there is still no sound and no output device found, then it's very likely that the logic board needs to be replaced. Take your MBP to an Apple Store or AASP for a check.

  • by rona11,

    rona11 rona11 Apr 14, 2012 8:24 PM in response to fane_j
    Level 1 (0 points)
    Apr 14, 2012 8:24 PM in response to fane_j

    I have tried almost everything, i am using lion, no system profiler in it

     

    And there is no start up chime too......huhu

     

    I never used headphones etc coz i dont have one....

  • by fane_j,

    fane_j fane_j Apr 14, 2012 8:48 PM in response to rona11
    Level 4 (3,667 points)
    Apr 14, 2012 8:48 PM in response to rona11

    rona11 wrote:

     

    i am using lion

    Then you should have posted in the Lion forum.

    no system profiler in it

    It's called System Information in Lion

     

     > About This Mac > More Info

    there is no start up chime too

    Sounds like the audio subsystem is kaputt. No remedy but replace the logic board, I'm afraid.