Sound is gone. Sound settings don't show any available output. Mute is checked. Cant uncheck

Suddenly, the sound on my Mac is muted. I tried to unmute using the keyboard. I can not. I went to preferences, sound and Output does not show anything available. There is no option for internal speakers or any other sound item. Mute is checked and I can not uncheck. Yesterday sound worked fine.

There are many possible causes for this issue. Take each of the following steps that you haven't already tried.
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. If your model has an audio-out (headphone) port, and anything is plugged in, unplug it before putting the system to sleep.
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. If you've installed a software equalizer called "Boom" or anything similar, update or delete it and restart.
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 the Output tab. If the Mute boxes are checked, uncheck them. Move the Volume sliders all the way to the right.
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. Reinstall OS X after backing up all data. For a possible shortcut, see this thread.
14. Make a "Genius" appointment at an Apple Store.

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My Final Cut sound effects don't show up, how can I get them?, My Final Cut sound effects don't show up, how can I get them?

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Have you downloaded them?
Incidentally, you seem to have a bad echo.

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Try zapping the PRAM. See KB Article http://support.apple.com/kb/PH11243 OS X Mountain Lion: Reset your computer’s PRAM
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// has nobody encountered this problem?

Thank you for your feedback, but I've solved the issue by now.
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Please HELP. !
There is no option called ( none ) on my payment method and i don't have any available credit-card now !

Howdy there Asaryeh,
It sounds like you want to select None as an option in your iTunes Billing info. This article explains why that is not available, and the criteria for being able to select it:
Why can’t I select None when I edit my payment information?
http://support.apple.com/kb/TS5366?viewlocale=en_US
If you want to select None and remove the payment information or credit card from your account, follow these steps.
Using an existing iTunes Store or App Store account
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After you pay for the order, you can change your payment information to None.
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Changing the country or region for an iTunes Store account
When you change the country or region of an existing Apple ID, you must provide a payment method. If you want to remove the payment method after you change the country or region, you can change your payment informationto None.
Thank you for using Apple Support Communities.
All the best,
Sterling

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Hi,
Locate to Services and check all services relating to wireless and network are enabled: Wireless Zero Configuration and WLAN AutoConfig, etc.
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http://kb.linksys.com/Linksys/GetArticle.aspx?docid=108496d0924847afaf9c4a7bb72110b5_5646.xml&pid=80&converted=0
Have you tried manually connecting to wireless?
http://kb.linksys.com/Linksys/GetArticle.aspx?docid=8fd9ee85a0bf42f0986ed23390be8c66_19850.xml
Andy Altmann
TechNet Community Support

My iMac will not play through it's speakers. Also, can't adjust the sound settings because it shows as non changeable.

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[email protected]

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Hmmm that is weird. Have you gone into your Ipod options and made sure under video, that you DO NOT have "do not update videos" selected. If that is not the problem then try this.
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Dell Windows XP

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The buttons still function, I just can't see them!

Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
*Use a compressed image type like PNG or JPG to save the screenshot
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Sound is gone. Sound settings don't show any available output. Mute is checked. Cant uncheck

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