Internal Audio Output suddenly doesn't work.

My internal speakers no longer work. When I go to the Sound control panel and select Built in Speakers, I get a message that says "The selected device has no output controls." The menu bar shows full volume as does the Control Panel but the volume control area is grayed and I cannot adjust anything. The same is true for the Internal Microphone setting in Inputs. I plugged a set of headphones into the jack, and get the same message. I think it must be a software error. I have restarted the computer but no luck. I repaired permissions, what else is there to try? Any ideas?

Welcome to the Apple discussions.
Your speaker volume is kept in System Preferences under sound. Probably worthwhile double checking that.
Then, reset PRAM, which houses speaker information:
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
If that reset doesn't fix it, reset the power management unit: http://support.apple.com/kb/HT1431
Please post back if those two actions don't change it's behavior.

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    HI,
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    Date/Time: 
    2012-08-08 09:12:38.278 +0100 OS Version:
    10.4.11 (Build 8S2167) Report Version: 4
    iChat Connection Log: AVChat started with ID 490058862. umtankie: State change from AVChatNoState to AVChatStateWaiting.
    0x162c2920: State change from AVChatNoState to AVChatStateInvited. 0x162c2920: State change from AVChatStateInvited to AVChatStateConnecting.
    umtankie: State change from AVChatStateWaiting to AVChatStateConnecting.
    umtankie: State change from AVChatStateConnecting to AVChatStateEnded.
    Chat ended with error -8
    0x162c2920: State change from AVChatStateConnecting to AVChatStateEnded.
    Chat ended with error -8
    Video Conference Error Report:
    Video Conference Support Report:
    Video Conference
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    Date/Time: 
    2011-02-12 19:02:04.123 +0000
    OS Version:
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    Report Version: 4
    iChat Connection Log:
    2011-02-12 19:01:35 +0000: AVChat started with ID 4179061126.
    2011-02-12 19:01:35 +0000: xxxxxxxx: State change from AVChatNoState to AVChatStateWaiting.
    2011-02-12 19:01:37 +0000: 0x88a3620: State change from AVChatNoState to AVChatStateInvited.
    2011-02-12 19:01:53 +0000: 0x88a3620: State change from AVChatStateInvited to AVChatStateConnecting.
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