My MacBook Pro speakers are stopped working and on screen volume icon shows in gray colour I am unable to change the volume.

Go step by step and test.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers.
    Make sure that Mute is not enabled.
2.Plug in and remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
    Try this even if you don’t see the red light.
3. Reset PRAM. http://support.apple.com/kb/PH14222
    Do this twice
4. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the appropriate method.
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
5. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so,uncheck it.
6. System Preferences > Sound> Sound Effects
    Play sound effects through:
   Select "Internal speakers" and then back to "Selected sound output device".

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My Macbook Pro speakers aren't working and the headphone jack is emitting a red light when I try to play something with sound. HELP!

The question says it all. It worked perfectly last night and stopped working this morning. A whole day has gone by and the speakers still don't work. I've plugged in headphones and that works.
When I try to increase volume or decrease volume, it shows me the mute sign which makes no sense at all. When I try to unmute, it stays muted.
HELP I'M ON THE VERGE OF BREAKING THIS P.O.S. LAPTOP

SO I just now had the same problem. A million threads online suggested to try inserting headphones, toothpicks, or even qtips to try and switch the "switch" inside the headphone jack. Everyone had great results from using the toothpick method. Well that didn't work for me. here's what FINALLY WORKED!!--> I wrapped a toothpick in fashion tape (fashion tape is basically stretchy double sided tape. If you don't have any ask some girls and someone will have). My thought was that maybe this "switch" didn't need to be flicked or pushed like a button. Maybe it was stuck in like a button that has been pushed in. I used the sticky toothpick to pull up the button/switch. Basically, take the toothpick and pressdown on the switch (supposedly the botton is inside the jack at the 6 or 7-0clock position) and then press the toothpick away (so that you are pushing in the opposite direction [1-oclock]). do this multiple times so you're flicking the toothpick back and forth. Just make sure you press firmly enough in the 6-oclock position so the tape can get stuck to the button.
Two tips for this method:
1) I had tried a manicure q-tip first, which in hindsight could've cleaned out the headphone jack, facilitating a surface that can get stuck to the fashion tape effectively.
2) You can see in the photo attached that I wrapped the tape on the toothpick a little past the edge so that there was extra tape on the end of the toothpick. That was (and this is just my theory) to make up for the fact that toothpicks have a tapered end. I figured that having this extra loose bit of tape at the end would allow me to reacch into any nook or crany of the headphone jack where this mysterious "button" might be lurking.

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See if a SMC reset will restore life in the MBP:
http://support.apple.com/kb/ht3964
If not, make an appointment at an Apple store genius bar.
Ciao.

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Hello,
Mac OS X: About the Reset Printing System feature ...
http://support.apple.com/kb/HT1341?viewlocale=en_US
10.5/10.6/10.7 instructions...
In System Preferences>Fax & Print, Right click or Control+click on the Printers list Sidebar, choose Reset Printing System.
if you hold option and click the "-" tab it resets the printing system.
http://www.macosxhints.com/article.php?story=20031215144430486
Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions.
Any devices that previously appeared in your Printer List and Fax List will need to be added again after resetting the printing system.
Resetting the printing system in Mac OS X 10.5.x+++
    1.    To use the Reset Printing System feature in Mac OS X 10.5.x, follow these steps:
    2.    Choose System Preferences from the Apple menu.
    3.    Choose Print & Fax from the View menu.
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http://support.apple.com/kb/ht1341
Reboot.

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Ciao.

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LN

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Ciao/

My MacBook Pro speakers are stopped working and on screen volume icon shows in gray colour I am unable to change the volume.

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