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Today I noticed something unusual on my MBP's audio.

When I played some music on youtube today, I noticed that something was different. The sound is noisy, like when in a car, you put the volume very high, it starts distorting. But, on low volume on my Mac, it creates the same effect.

Anyone with the same problem? Anyone knows how to fix it? It didn't do it earlier... Maybe some SO update messed up the audio drivers/codecs?

Update:
I performed a PRAM and NVRAM reset and a SMC reset and it didn't solve anything.

Also, deleted the *.plist files in ~/Library/Preferences/Audio as suggested here and again, it didn't solve anything.

I'm getting desperate...


Update2:
Got in recovery mode, started Disk Utility and used the options Fix disk and Fix disk permissions and once again, it didn't solve anything.

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Anyone? It's really anoying... –  silentw Jul 12 '12 at 13:33
    
Does it only do it with that one video or with every video or song? Does it happen in iTunes or when using QuickTime? Also, which OS version are you running 10.7.4? Do you have any software that has changed your volume/music settings? –  de_an777 Jul 12 '12 at 22:09
    
Your question is a little vague, so it's a bit hard to determine what might have been the cause. When did you first notice the issue? Did anything significantly change that may have caused the audio distortion? Any recent installs? Have you recently made any changes to /Utilities/Audio MIDI Setup? –  harpermd Jul 12 '12 at 23:52
    
I'm running 10.7.4, installed all the recent updates. It happens in every song, even with system sounds. @harpermd I checked the Audio MIDI Setup and I think it's all ok... de_an777 I don't think that I have any software that has changed my volume settings... Request me more info so that you try to determine what might have been the cause for this, I don't really know what info can help to do it... –  silentw Jul 13 '12 at 10:16
    
I really need help on it, please anyone! –  silentw Jul 20 '12 at 15:58

1 Answer 1

up vote 1 down vote accepted
+50

If all sound from your machine is distorted there may be a hardware problem with your Mac's speakers.

To test, I would reinstall Lion from your recovery partition and see if it is the same. If you still have problems with the sound you should take your Mac to an Apple Authorised Service Provider.

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From my guess (since startup chime isn't distorted (as suggested test by iphonedev46)), it is software related, not hardware. Reinstall Lion would be my last resource, maybe any way to reset audio settings? –  silentw Jul 23 '12 at 16:56
2  
@silentw you have already reset audio prefs with nvram reset. In my experience with niggly problems like this it is usually quickest to reinstall the OS (aka 'archive and install'). This preserves all of your data, apps and user preferences if you're worried about that. It also wipes any non default, possibly conflicting kexts or preferences very efficiently. –  Robin Jul 24 '12 at 13:31
    
I guess I'll try that, but since I'm finishing a project, I guess I'll delay that action, thanks! –  silentw Jul 26 '12 at 19:58
    
Just updated to Mountain Lion and I still have this sound problem. Do you think that if I follow your method it will do anything? Thanks! –  silentw Jul 30 '12 at 20:25
    
@silentw in all honesty, no probably not, you've basically done what I've described by upgrading to 10.8. I would get a second opinion on the sound at an Apple store (or similar) if possible next. –  Robin Jul 31 '12 at 23:40

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