Internal speakers not working with Mountain Lion

I have found the headphone wiggling as I remove the jack to have corrected the problem for me as well.

What didn't work:

NVRAM reset

SCM reset

toothpick

blowing into headphone jack hole

disconnecting headphone jack while adjusting the volume controls

What did work:

multiple disconnect of the headphone jack (one with the mic included - mine was JVC). By multiple I mean more than 20 times and very slowly, moving the jack around while pulling the jack out.

Cheers

It solved my problem thanks alot 🙂

I used blew some canned air into the port, freed up the micro switch and now everything works fine again.

Mine worked with a little gentle wiggling too! Tried most of the tips others posted here but that did the trick for me! If it makes any difference, I have a late 2011 13-inch mac pro.

Thanks for that tip!

Addendum to my post from yesterday - had the same problem again when I turned laptop on. Did the wiggly thing with the headphone jack and it worked again. Unfortunately, it seems to be a temporary fix only.

great....4-5 times plug / unplug earphone and problem solved.

Inserting headphones re-activated the sound and sound icon in uper screen menu bar became black (rather then grey) taking the jack out again then fixed the problem, sound is back. Strange though!

I had the same problem. I tried several suggetions taken from forums (including Apple Communities) nothing worked. Plug in and unplugging earphones repeatedly didn't work either. However I tried a somewhat similar trick that works on the sustain pedal port on Yamaha keyboards for reversing its polarity. Plug in the earphone jack (greyed out speaker symbol at top of screen turns black), leave it plugged in and then shut down the laptop. While it is off, unplug the earphone jack and then restart the laptop. Back to normal. This is what I did because I suddenly remembered this same trick being sometimes used on Yamaha keyboards. There seems to be some sort of a circuit-to-firmware protocol (made up jargon) that is set to memory when the machine shuts down. I'm not suggesting this as scientific & universal (who knows, maybe it just fixed itself irrespective of what I did) but it seems to have worked. It may be worth a try.

Thanks...

this worked for me, I had to do it a few times but I now have my Internal Speakers option back. I may still keep my Genius Bar appoinment tomorrow to see "what" they say"

many thanks for your post

cheers

dave

Thanks lizardcarter !

Your suggestion worked perfect!!

http://support.apple.com/kb/HT3964 Try resetting your SMC, then go into system preferences>sound>output and select "internal speakers" then try to play something. Let me know if that works 🙂"

This solution worked for me too (putting computer to sleep for a few seconds!) Voila! sound is now working fine... (I have OS 10.8.5)

Giuseppe!!!! I tried everything and the only one that worked, WAS THIS ONE!!!! So funny. Thank you man

dude this drove me crazy the pic method seemed to work for me you guys are awesome apple needs to figure this out im using a mid 2012 mac book pro

This absolutely worked but took me like 10 times. Be patient and believe! Thanks.

Man, tried this once and it didn't work so (almost) went through the whole SMC checklist before trying it a few more times. Worked like a champ. Thanks!