IMac suddenly has no audio except system audio.

Very odd.
I have no audio for movies, music, youtube etc, but I have system audio sounds like mail, trash emptying and those kinds of things.
I have tried rebooting and double checking connections.
It's almost like some driver or file has disappeared.
I do have an up to date Time Machine, so if anyone could tell me what to restore I'll try that.
Thanks!
Korky

OK, I've now got the audio device back on Device Manager, by updating the BIOS - it detected the hardware change.
It's listed as Audio Device on High Definition Audio Bus.
It finds the driver from Windows Update but won't install the driver, though. It fails before completing.
When I try and update the driver I get a similar error - saying that there is an I/O error.
Does anyone know how I fix this?
The tech support guy I spoke to suggested I go straight to doing a reinstall of Windows. Any softer/less painful options likely to work?

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This is how it happened:
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System management control reset:
1. plug out everything that connects to the imac
2. press the power button for 7 seconds
3. don't start the imac yet!
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<Edited by Host>

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Run the latest security updates for 10.6.8:
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https://discussions.apple.com/docs/DOC-1992
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Hello,
My iMac 27"(late 2009), Audio in/Optical digital audio out port, stopped recognizing my new Bose speaker system, previously working through that port. I tested the speaker system through my iPhone, and it works fine. I hooked it up to the Headphone out/Optical digital audio in port, and it works through that port also. I did a computer restart, I also checked all wiring and did a system repair on the computer. I also restarted the computer in mode where I could use the system utility, and the computer still did not correct the matter, and it reported everything as being "ok". I wented into "sound", through system preferences, and the computer does not recognize anything I plug into the Audio in/Optical digital audio out port. When I plug the speaker sysytem into the headphone out/optical digital audio out port, it does recognize the Bose speaker system as being "headphones".
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Here is a link to Costco, where I bought the system, and the exact system I have, if this is any help: http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=bsd&cs=04&sku= A4092931&ST=pla&dgc=ST&cid=262075&lid=4742361&acd=1230980794501410
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If any of you have any ideas regadrding wear and tear, and fix I can do, etc., besides having to take my computer into Apple? Thank you, and potentially all of you, for your time and effort in helping me with this issue. Thank you kindly.
davE

Okay, davE, first, you have posted in the "Mac Pro" forum (not Macbook Pro), so we can't be super helpful
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http://www.amazon.com/gp/product/B004HBWYQ6/ref=oh_details_o00_s00_i00
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\\turning off automatic standby||
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John B

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3. If you've installed an application called "Memory Clean" or any other third-party software that is supposed to "clean" or "purge" memory automatically, remove it according to the developer's instructions and restart. You should do that even if the software is not causing the problem, because it's useless.
4. If you've installed a software equalizer called "Boom" or anything similar, update or delete it and restart.
5. If an AirPlay device is selected for sound output from iTunes (or from other applications via third-party software such as "Airfoil"), deselect it.
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7. If a red light is coming from the audio-out port, the internal switch is stuck in the position for digital output. You may be able to free it by inserting and removing a mini-stereo jack of the proper size. Inserting any kind of tool in the port may cause damage that won't be covered by your warranty.
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8. Disconnect all wired peripherals except keyboard and mouse, if applicable. If more than one display is connected, disconnect all extra ones. Restart and test.
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10. Start up in safe mode. Don't log in; just restart as usual when the login screen appears. When you do, make sure the words "Safe Boot" do not appear in the login screen. If they do, the system is still in safe mode and sound won't work.
11. Reset the NVRAM.
12. Reset the SMC.
13. Reinstall OS X after backing up all data.
14. Make a "Genius" appointment at an Apple Store.

My iMac suddenly no longer connects to wifi network when in KIOSK (username) mode, and only connects when as ADMINISTRATOR mode. Its strange because the iMac has been working fine in KIOSK mode for over a year until 2 days ago.

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One of the memory cards was indeed faulty, and the other completely fine
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i go back to cs6 on my other comp they open fine...
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troy

I can verify that Apple screen recordings without audio do not import into any Adobe premeier.
Details on screen recording from Gspot v2.70a:
H.264
qt : Apple QuickTime (.MOV/QT)
File Type: QuickTime (.MOV)
Mime Type: video/quicktime
Len: 1:03.083
Frms: 1,521
Qf: 0.153
Frames/s: 20.000
wx: 1280 x 800
sar: 1.600 (8:5)
However Apple (MAC OSX) screen recordings WITH audio will import.
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Edit:
To help those with this issue.. just make sure when you render your mov that you have ANY kind of audio in it.. and just remove the audio track once imported into premiere. I know it's frustrating and you would think something as simple as not having an audio track wouldn't break premiere but alas... we have to work around the shortcomings until they decide to fix it.. just like the VFR issue in premiere.

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http://docs.info.apple.com/article.html?artnum=302588
Except that the file in question isn't muxed, from what I can tell. I opened it in QuickTime and clicked "Show Movie Info" like the article says, and QT says the movie is MPEG4. It doesn't say "MPEG1 Muxed" or "MPEG2 Muxed."
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I saw this on a forum from about four years ago:
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IMac suddenly has no audio except system audio.

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