There is no sound on my MacBook

What happens when you press the sound up / down function keys?

Is it something like this?

This happens to me all the time. You should see a little red LED light in the audio input jack, take some sorta pin/paper clip or anything like that and stick it in the jack along the side where the light is. It should feel like you're pushing a button with the object. That should fix your sound, but if not restart your computer after doing this and it should be fine.

What if the light had been on but then went off?

I had a similar problem with my MacBook Pro 17" (latest version). The internal speakers stopped working and disappeared from the Sound Output choices, but the headphones does work.

In another thread they recommended inserting a tooth pick into the headphone jack. I actually removed and plugged in the headphone (while listening to music) a couple of times and the speakers came back on.

I will monitor this situatioto find out what is causing the problem. I am using a new headphone with noise cancelling (battery operated), and a 27" Apple monitor with thunderbolt.

Good Luck!

I had no sound yesterday on Mb. Mountain Lion

Got into my sound settings the sound was redirectet to Apple Tv.. Hope it could be similar problem unless you have fixed it since its and old post..

Unsure the sound man

Thanks to jeffchau

This happens to me all the time. You should see a little red LED light in the audio input jack, take some sorta pin/paper clip or anything like that and stick it in the jack along the side where the light is. It should feel like you're pushing a button with the object. That should fix your sound, but if not restart your computer after doing this and it should be fine.

yes

You might find better luck starting a new thread instead of replying to a 4+ year old thread in which no one has posted more than once.