internal speaker output device missing

I have a similar problem, but its different, It detects my headphones, It displays they are in, but no sound comes out of my headphones. Ive tried at least 4 different pairs of headphones. There is the same problem with my line in jack, it doesnt work.

Hello,
As the guy said above,,,,,
Use a toothpick, and poke around in the headphone jack hole. "Gently"
Make sure you have Volume Preferences open so you can see what's going on.
You will see it change from Digital Out, back to Internal Speakers..
Yeah!!!

Brilliant idea. After a few seconds of gentle poking around, the light went off and sound returned. It seems the microswitch collects dust (just like the rest of the machine) and that was causing mine to stick. When I pulled the toothpick out, it had a little dark, sticky dust on the end of it.
Kudos to whoever brought that info to the thread.

Ciao,
B

Thanks Robert!
Even 2+ years later your suggestion helped!

Any suggestions for keys not working? (Caps lock and the #four/dollar sign key)...

I had this problem, the toothpick worked. I just shot some silicone in there and "jacked" it around with some headphones. Seems okay for the moment. This on an almost-two-year-old Macbook Pro.

$4000.00 for a laptop and it doesn't come with its own toothpick. Shameful!

Plugging in the headphones, muting, pulling the headphones out, and unmuting... Worked for me.

So amazing that it worked... I know it's not the solution for all, but wanted to give it a thumbs up in case it would help anyone else...

did you find any solution for your problem yet?

http://discussions.apple.com/thread.jspa?threadID=1437916&tstart=0
this might be of help?
it worked for me!!
thus shutting down system, taking batteries out. restart system...

me too...
first time around, it worked after re-booting the system, but it came back..
so I have (for the past 5 minute or longer) tried the head phone trick, since I couldn't find a toothpick. 😟
IT works!

anyhow, I realized that when people mention the 6 o'clock, 12 o'clock directions, it means not towards you and towards the front of you, but more so downwards and upwards.. am I right? I think for me, when I tried to wiggle the headphone jack up and down(rather than front and back) it worked..

I can confirm that plugging your mini jack headphones in and out a couple of times fixed the problem here on a fairly new MacBook.

When this happened to me, I was using a pair of Sony headphones and I have to say that they don't fit as smoothly as the apple earbuds. Maybe this is just caused by a bad fit of non-apple mini jacks.

Toothpick is a must have tool for next generation laptop.

What a joke, few thousands bucks and a faulty switch!!!!
Is mac turning slowly into Windows?

thanks for the toothpick idea. just worked for me.