Built-In Audio Devices disappeared

Greetings everyone,
I got a big audio problem.
The Built-In Audio Out and Inputs of my iMac (2011) disappeared in system preferences and i noticed the coreaudio process has high CPU usage all the time. Even force quitting isnt helping, as it restarts immediatly.
Furthermore my computer is hanging on shutdown:
If it's entering sleep mode, the display goes black but fans and HDD are still spinning, but I cannot do anything else and I have to do a hard reset. The same happens when i'm restarting or shutting down. It just won't shut off completely (I guess because of that hanging process)
I booted another OS X installation and everything worked fine, so there's clearly an error somewhere in my current OS X installation. But restoring from a Time Machine backup didnt help.
Are there any files/caches I have to move to trash or anything else to fix this problem without having to reinstall OS X once again?
Thanks.

See this link for solution.
http://discussions.apple.com/thread.jspa?threadID=807277
Thanks to the poster for answering.

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cornelius wrote:
ypw:
Try:
Resetting the PMU.
cornelius
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Message Edited by HPdv6618ca_edmo on 10-02-2009 12:58 PM
Message Edited by HPdv6618ca_edmo on 10-02-2009 12:59 PM
Message Edited by HPdv6618ca_edmo on 10-02-2009 12:59 PM

Hi There,
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[email protected]
HPdv6618ca_edmo wrote:
Hi There,
I hope someone can help me. I have been struggling with NO AUDIO problem for last 4 weeks. Intially I had a big red cross in front of voice control button. I had to reformat and installed original softwares using recovery.
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PC is clean as it is fully formated and only HP original OS softwares are installed + Windows updates.
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Message Edited by HPdv6618ca_edmo on 10-02-2009 12:58 PM
Message Edited by HPdv6618ca_edmo on 10-02-2009 12:59 PM
Message Edited by HPdv6618ca_edmo on 10-02-2009 12:59 PM

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Fix for Missing Audio Device in WinXP S

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re: sound device errorThursday, April 2, 2005 at 6:02 amPosted by Ven <FONT size=-2>(<I> messages posted</I>)
RE>Hello to all,
I got much useful information from this topic, but none of them resolved my sound
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ps.
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in case of something goes wrong. You can boot XP to safe mode by pressing F8 at the
beginning of the Windows startup and select Safe Mode if the system doesn?t start
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Ven
</PRE>

Hi
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