Internal speakers, not found

somehow my computer seems to have uninstalled its internal speakers, any idea how i can reinstall them?

I had the same problem too! I called Applecare and, though they were very nice, they couldn't fix it. I had thought of trying what you recommended with the analog plug, but never did it. IT WORKED! THANKYOU!
Incidentally, I think the problem may have been caused (at least in my case) by doing the same thing. I was playing music through an amplified PA system and whenever there was no music to cover it, there was this high pitched whine or hum. It was definitely coming from the computer, so I would unplug it between things. It hasn't done it on any other external speakers, but it did it 2 weeks in a row on the same system. I haven't been able to test it again since getting the internal speakers back. Any thoughts about that?
MacBook Pro   Mac OS X (10.4.7)   100 GB HD, 1GB RAM?
MacBook Pro   Mac OS X (10.4.7)   100 GB HD, 1GB RAM?

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