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From: Kevin McMurtrie on 21 Jul 2010 01:32
In article <1jlxxfw.1s5x7hm1v4x8ocN%dcohenspam(a)talktalk.net>,
dcohenspam(a)talktalk.net (Daniel Cohen) wrote:

> Kevin McMurtrie <mcmurtrie(a)pixelmemory.us> wrote:
>
> > The "no output device available" part is troubling. For years there was
> > a bug in MacOS X where the "Optimizing System" stage of the Apple
> > Installer overwrite code libraries with zeros if another application
> > loaded them at the same time. I think Leopard had it. Simply hitting
> > the volume key or causing a beep at the wrong moment could cause the
> > audio libraries to be destroyed. If that's it, reinstalling the OS from
> > the installer disc or a backup will fix it.
>
> That's an interesting possibility. I need to try a few other things
> first, as I don't trust her to re-install the OS herself.
>
> Where would I find the relevant code libraries? Would it be possible
> just to reinstall those, say from a Time Machine backup?

Audio Libraries:
/System/Library/Components
/System/Library/Frameworks

Hardware drivers:
/System/Library/Extensions

The system profiler may say more about which is missing.

If you're good with UNIX you could try these -

Search for zero-length files:

find /System/Library/ -type f -size 0

Search for files starting with 32 zero bytes:

find /System/Library/ -type f -exec echo -n "{}:" \; \
-exec xxd -l 32 -c 64 -p {} \; | grep \
':0000000000000000000000000000000000000000000000000000000000000000' \
| cut -f 1 -d':'


Of course some of these files are supposed to be empty or starting with
zeros. If you find anything that appears to be related to audio you
could compare it against a working system.
--
I won't see Google Groups replies because I must filter them as spam
From: Daniel Cohen on 21 Jul 2010 03:40
Jolly Roger <jollyroger(a)pobox.com> wrote:

> In article <1jly787.1ie6qeu1swdpx8N%dcohenspam(a)talktalk.net>,
> dcohenspam(a)talktalk.net (Daniel Cohen) wrote:

> >
> > By "resetting" did you mean resetting the PRAM? Or resetting something
> > else? Resetting PRAM was one of the things I was going to get her to
> > try, but for the moment it seems to have cured itself.
>
> If your audio out port has a red light coming from it, it means the
> sound port is stuck or confused into thinking you have an optical audio
> device plugged in. The solution is to plug and unplug something into the
> jack a few times to reset it (until the red light shuts off).

Really useful info. Thanks.
--
<http://www.decohen.com>
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