My Imac doens't play any sound

my Imac doens't play any sound, can someone help me, I want to listen some music and I can't the volume controler doesn't move.

There are many possible causes for this issue. Take each of the following steps that you haven't already tried. Back up all data before making any changes.
1. Start with the steps recommended in this support article. Don't skip any of the steps. It's the starting point for further efforts to solve the problem.
2. Run Software Update and make sure you have a fully up-to-date installation of OS X.
3. If you've installed an application called "Memory Clean" or any other third-party software that is supposed to "clean" or "purge" memory automatically, remove it according to the developer's instructions and restart. You should do that even if the software is not causing the problem, because it's useless.
4. Other third-party software that has been reported to interfere with sound output includes "Boom" and "Samsung Kies." If applicable, uninstall according to the developer's instructions (not by dragging something to the Trash.)
5. If an AirPlay device is selected for sound output from iTunes (or from other applications via third-party software such as "Airfoil"), deselect it.
6. Launch the application "Audio MIDI Setup" by entering the first few letters of its name in a Spotlight search and selecting it in the results (it should be at the top.) Select Built-in Output from the list on the left. If the Mute boxes are checked, uncheck them.
7. If a red light is coming from the audio-out port, the internal switch is stuck in the position for digital output. You may be able to free it by inserting and removing a mini-stereo jack of the proper size. Inserting any kind of tool in the port may cause damage that won't be covered by your warranty.
If there's no red light, the switch may still be stuck in the headphone position. Try to free it the same way.
8. Disconnect all wired peripherals except keyboard and mouse, if applicable. If more than one display is connected, disconnect all extra ones. Restart and test.
9. If you have a MacBook Air, turn off Bluetooth and restart.
10. Start up in safe mode. Don't log in; just restart as usual when the login screen appears. When you do, make sure the words "Safe Boot" do not appear in the login screen. If they do, the system is still in safe mode and sound won't work.
11. Reset the NVRAM.
12. Reset the SMC.
13. Triple-click anywhere in the line below on this page to select it:
/Library/Preferences/Audio
Right-click or control-click the highlighted line and select
Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item selected. Move the selected item to the Trash. You may be prompted for your administrator login password. Restart the computer and empty the Trash. Recreate your settings in the Sound preference pane.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.
14. Reinstall OS X after backing up all data.
15. Make a "Genius" appointment at an Apple Store.

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I am using a mini display to hdmi with my macbook and the display works fine. However, the sound will only play iTunes such as music and movies but when i go online to watch movies on youtube it will not play any sound. Please help

I am using a mini display to hdmi with my macbook and the display works fine. However, the sound will only play iTunes such as music and movies but when i go online to watch movies on youtube it will not play any sound. Please help

HDCP maybe? Read this http://www.macnn.com/articles/08/11/26/displayport.drm.conflict/

I've upgraded to OS 10.8.2 and my Bowers and Wilkins MM-1 Speakers were working fine until today, and now they won't play any sound at all, even though iTunes shows the audio is playing. I've tried both the headphone jack and the USB port. Please help!

I've upgraded to OS 10.8.2 and my Bowers and Wilkins MM-1 Speakers were working fine until today, and now they won't play any sound at all, even though iTunes shows the audio is playing. I've tried both the headphone jack and the USB port. Please help! I don't want to have to be stuck using my internal speakers!
Thank you,
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Michael,
Thanks. I haven't mixed down the audio or checked the number of tracks in Prefs. Good points.
As far as a mixdown goes, I'll definitely give it a try, though I wonder whether or not the tracks will be recognized during mix down recording - given that you can't hear either of those segments in playback. Just have to try.
Re the preferred number of allowed tracks - I'll go check as soon as I send this off, but I'm not sure that applies in this case, since the two Channels containing the segments that are pinked out are not in additional tracks. I should have mentioned that other audio clips and segments on the same Channels in the SAME tracks ARE heard in playback. As are two additional track in the 2nd Sequence. It's only when the two sequences are joined that the pink tinted segments can't be heard. Within the sequence the same audio cuts playback as they should. Thanks again &
Best regards,
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Front earphone plug does not cut out speakers or plays any sound

I have an HP Pavilion Media Center TV m7480n Desktop Pc. I upgraded to Windows 7 32. After install the front earphone plug no longer cuts out the speakers or plays any sound. I updated all the Realtek drivers. In Realtek HD Audio manager the green and pink front plugs are light color. I tried both the advanced settings to play back devices. Neither work. I had the front plug and the headphones checked out and both are functioning. I have been using the rear plug for my headphones and switch plugs with my speakers when I need them. I miss my front plug. Any Ideas?

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...an HP employee just trying to help where I can, but not speaking on behalf of HP.

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http://h10025.www1.hp.com/ewfrf/wc/siteHome?cc=us&lc=en
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******Clicking the Thumbs-Up button is a way to say -Thanks!.******
**Click Accept as Solution on a Reply that solves your issue to help others**

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Hi Michaelgst,
Welcome to the Apple Support Communities!
I understand that you do not hear sound from Safari on your computer but you do hear sound in other applications. There may be several troubleshooting steps I would suggest to troubleshoot this situation.
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if it plays when you connect a headset then
https://discussions.apple.com/thread/1343532?start=315&tstart=0
more
https://www.google.dk/search?client=opera&q=iphone+stuck+in+headphone+mode&sourc eid=opera&ie=utf-8&oe=utf-8&channel=suggest

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My Imac doens't play any sound

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