There are a bunch of posts to the Apple Discussion forums about sound corruption after doing an OS update with the LED cinema display connected. My experience has been that after some use the sound coming through the LED display speakers will start to get choppy and then entirely quiet except for a couple chirps here and there. To fix it, I either go into the Sound preference pane and switch the output from Display Audio to Built In and back again, or if that doesn't work uplug and then replug the USB connector which carries the audio. Unfortunately, since this happens constantly, it makes using the LED display speakers incredibly inconvenient. I've reverted to using headphones most of the time since the corruption does not happen when using built-in audio. According to the posts on the forums, the only way to fix this is to reinstall the operating system from scratch, and at the moment I'd really prefer not to do that.
Has anyone else run into this problem, and if so, have you found a workable solution? From the forum posts and from my own experience, this is clearly a software issue, and most have said the only workaround can come from Apple. However, you guys are clever, so there may be a solution out there somewhere.
Forum Posts:
LED Cinema Display weird ticking noise discussions.apple.com/thread.jspa?threadID=2052349...
Degrading audio quality on 24" LCD discussions.apple.com/thread.jspa?threadID=2198795...
MacBook Air, Apple 24" Cinema Display and Audio Problems? discussions.apple.com/thread.jspa?threadID=2206424...
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Corrupted sound after updating (10.6.2)
You have described my problem exactly. Decided to do some web searches to see if it was driver, firmware, hardware. Well, at least you have answered that. I don't see any posts to resolve it yet, but I will keep looking. If I find something I will re-post here.
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I actually managed to fix the problem, but it involved reinstalling the OS fresh and then restoring certain things from my Time Machine backup. I installed Snow Leopard fresh then used migration assistant to restore everything except my applications and "other files and folders" (which added up to about 5.6 gig). I assume these other files and folders were the root /Library folder, but I can't be sure. I also performed all OS updates without the LED display attached.
This seems to have fixed the problem. I've been running for a couple days without any sound issues. So my theory is that there's some issue either with performing OS updates with the display installed or with some corruption to a file that would have been transferred over in the "other files and folders" option.
This seems to have fixed the problem. I've been running for a couple days without any sound issues. So my theory is that there's some issue either with performing OS updates with the display installed or with some corruption to a file that would have been transferred over in the "other files and folders" option.
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I have it as well, I actually got a new ssd so I installed 10.6 from scratch and I didn't migrate my data from the old one. I did run the update when the display was connected. I am not sure if before updating to 10.6.4 the problem was there.
Disconnecting the usb and connecting it again, does the job for a while.
Maybe the only thing you can try is to not run an update when the display is connected as hungryfilmmaker did
Disconnecting the usb and connecting it again, does the job for a while.
Maybe the only thing you can try is to not run an update when the display is connected as hungryfilmmaker did
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