Built-In Audio Output Speakers Don't Work

My Built-In speakers don't work on my Macbook Pro anymore.
I plugged headphones into the headphone jack last night when watching a film, now all of a sudden when I remove the headphones my built in speakers dont work.
When I try to turn up the volume I get the circle with a line through it telling me it can't be changed.
I went to system preferences and it says my speakers can't be configured and my Master volume track is un-highlighted so It can't be changed.
Whats going on?
Macbook Pro 15.4" 2ghz Mac OS X (10.4.8) 1GB, 100GB HD, 256MB Video, Final Cut Studio 5.1, Panasonic DVX100, 1TB EXT HD

Is there a red light glowing inside the jack? It sounds like a faulty jack. Read this:
http://forums.macrumors.com/archive/index.php/t-232084.html
-Bmer
Mac Owners Support Group
Join Us @ MacOSG.com
iTunes: MacOSG Podcast
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Is there a red light glowing inside the jack? It sounds like a faulty jack. Read this:
http://forums.macrumors.com/archive/index.php/t-232084.html
-Bmer
Mac Owners Support Group
Join Us @ MacOSG.com
iTunes: MacOSG Podcast
 An Apple User Group 

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Message was edited by: Carolyn Samit

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I have a mac mini (A1283) with OS 10.7.4. Upon upgrading to 10.7.5 it did not start up again. Instead, the light was on and the hard drive did not start up. The light on the connected USB mouse was not lit.
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My husband uses the dual USB late 2001 iBook more than I do, mainly with Toast and a Griffin iMic to copy our old vinyl records to CDs, and to run VirtualPC for his PC model railroad design app. He does all this in OS 9.2.2.
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Ronda and Dave2,
Thanks for responding.
I'm beginning to think it has to be a hardware problem. It happens in both OS's, and when booting from the OS 9 install CD that came with the iBook - no startup chime at all. But the chime is there when either headphones or external speakers are hooked up.
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Dorothy

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My headphone jack works but theres a red light coming out of my headphone jack when its unplugged and my internal speakers will not work...anybody have an idea? Tried system preferences and says no options for selected audio and cant get any sound for my built in output speakers and my volume display in my bar is faded....HELP!

@Spencer
I know this thread was marked answered but thought I should chime in since my MBP (2.66Ghz Late '08, bought May '09) started to exhibit this behavior. I was getting "No Output" greyed out speaker images and the red light coming out from the headphone jack. It's been intermittent but finally wouldn't go away so I figured I'd contact Appe.
This afternoon I called Applecare and was advised to take it to the Apple store... no questions asked, no troubleshooting steps, just told me to take it to the store and even offered to make me an appt. I was able to get an appointment at the genius bar same day (literally 2 hours after I hung up the phone). My wife took a ride with me and we headed down there.
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I agree with Rod to take it in, esp. if you're still under warranty. I should also mention that this only started happening a few weeks ago but the red light part was rather sudden.
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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.

Built-In Audio Output Speakers Don't Work

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