Sound on MacBook Pro doesn't work sometimes

I have the early 2011 pro and sometimes the volume doesnt play at all, even when i lower or raise the volume..No music plays or video at all. Even with headphones plugged in or not plugged in.The only way for the sound to come back is if i restart the macbook..Is there another way to fix this..its so annoying. And there is no water damage or anything at all. I treat this macbook like a newborn baby.

Have you tried a reset?
Restore?

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After Yosemite install, sound button on MacBook Pro doesn't work-stuck at full volume or Mute. Can't adjust slider in preferences, or use volume button on keyboard.

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The audio input on the 2011 13-inch macbook pro doesn't work

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I bought a 13-inch macbook pro in early 2011( the latest version). It says in the technical specs that it has a "Combined headphone/line in (supports digital output)" and the guy working at Apple store told me i could plug an electric guitar right into the computer, trough a 1/4"-to 1/8" adapter. I tried it, it doesn't work, and the line-in channel doesn't appear in the sound preferences.
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HELP, the display of my macbook pro doesn't work.

The whole thing is like this. someday i just turned it on normally after i turned it off 2 days ago. and the thing happened.
i can hear the noisy form hard driver, SuperDrive , the startup tone and even after a while ,i could hear the "bo bo" when u press the sound-adjust key,F3 n F4. the keyboard worked fine but not the display.
it kept in black. not like the black screen in windows, it seemed like the display did not connect any power. meanwhile, the sleep light was on, in grey. so the whole thing is like the display system is in a sleep model but the other parts of the laptop are awake.
so i ve search some resolutions for similar problem. such like sleepimage , PRAM .but none of them is effective.
and i notes a new detail which could be different. when i rotate the lip, in some angle the sleep light would go bright white ,but in a right angle as it is when we work on it ,the sleep light get grey. if u keep on, almost 120,the max angle. it turned to be bright white again. and when i close the lip, originally, the light should be up and down like breathing. but now it keep solid bright-whitely, and the fans and hard disk sound like keep working .
it has been expired, so the apple care would be so expensive to solve some simple question.
does anyone know what happen to my Macbook pro? so that i could choice if i should send it to Applecare or not.
Thanx a lot

This morning I experienced exactly the same. So I immediately went to a Apple Premium Reseller this afternoon and handed over the MacBook. They told me this was their first case ever of this kind.
Anyway, it needs to be repaired, but before this they are going to run a test or two in order to get a precise indication. They also checked with the pram while I was in the shop. It might be the latest issue with the nvidia which concerns all the MacBook Pro's produced during spring 2007 until autumn 2007.
Lastly, I will give a call to Apple on Monday to discuss this matter because the Macbook is now fifteen months old. This Ferrari or Porsche of all Macs shouldn't behave like this.
By the way, I replaced my battery after 479 cycles last Wednesday for € 135. Still I don't think this has anything to do with this issue.
I keep you posted,
Mehdi

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Hello to everybody!
I hope, that somebody out there can help me as fast as possible.
I spread a coffee over my 1-year old MacBook Pro keyboard and as fast as I could I turned it head down, so that the coffee could come out of the keyboard. I cleaned the keyboard and tried it out, if everything still works... in the begining it worked, but then some letters begun to not work anymore or I couldn't write some big letters anymore... so I desided to put my extern keyboard from an other computer on my MacBook Pro so I could at least write with this extern keyboard. But now as I wanted to put this extern keyboard away my MacBook Pro keyboard doesn't work anymore at all. Now I have the question, if I need to give in somewhere an order on my laptop that I want to use again the laptopkeyboard instead of the extern-one? The problem is, that normaly with windows I was used to just put the extern keyboard away and my computer realized on his own that it needs to use the own keyboard again, but with the MacBook Pro this doesn't work, so I'm a little bit confused and don't know, if my keyboard is now totaly damaged or if I just need some computer-language-order to tell my computer to use the normal keyboard again.
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Kati

i'm not suggesting it also, but it could work .
Btw, i will take off the keyboard from the MBP, disconnect the conector, so you can really give him a bath and shake it.
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so, a good bath in distillate water, with a lot of shaking, you can also press on keyboard keys, shake it, and so on, and 2 days under a august sun..
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and give us some news.

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Hello there,
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Try logging into a different user account. If the issue does not occur when logged into a different user account, then troubleshoot for software issues.
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http://support.apple.com/kb/PH10680
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For several months my (late 2007, 15 in) macbook pro screen was not working at all. I took it to apple at one point and they said I would need to replace my screen which would cost at least $400 or $600 I can't remember how much. I just knew it was too much.
Then recently I found out that my model had the NVIDIA GeForce 8600M GT graphics processor and Apple found out those had a problem in a number of those computers so they are supporting it by replacing the mother board.
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My SCREEN MAGICALLY HAS COME BACK ON just last night and this morning... it was working and then Poof it went off again.... now again it's magically come back on.
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That's a very interesting offer. There are a finite number of LCD manufacturers, and it could be there are models that can go in different computers. The construction of the display and the cables would be different for different computers. It would depend on whether the LCD is specifically configured for Apple or if Apple uses an "off the shelf" LCD and then configures the housing and cables.
Generally, in manufacturing, you try to use as many off the shelf parts as you possibly can. For example, you would use standard screws and fasteners unless you had a special need for a non-standard one. If there is already a LCD on the market that meets your specs and your needs, then it would make sense to use it rather than to have something special made.
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If the price sounds reasonable, then it sounds like you don't have much to lose by letting the guy have a shot at it. I wonder if he would let you watch while he works--it might be very illuminating.
Good luck!

Sound on MacBook Pro doesn't work sometimes

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