Why has the volume control on my Mac suddenly stopped working?

Every time I push any one of the three volume buttons in the top right corner of the keyboard on my mac, I get this image:
http://i47.tinypic.com/2ushmpk.png
And no matter how many times I push the buttons, the volume will not adjust and that circle with a line through it appears at the bottom. When I try to play music, there is no sound.
At the top right of my screen where there is usually a volume bar, there is now nothing. That bar has also disappeared.
http://i46.tinypic.com/10ehu1l.png
What do I do? I have a Macbook Air.

have you turned it off in restrictions?

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Right-click on Magic Mouse and Volume Controls on Wireless keyboard suddenly stopped working

I am running Mavericks 10.9.2 on an Late 2012 iMac.
One morning the right click on my Magic Mouse and the volume controls on the wireless keyboard stopped working.
These mouse and keyboard themselves seem fine; they work okay ehn used on a MacBook.
Everything else about the mouse and keyboard is fine.
This seems to be a problem what has been around for a whole, with a wide variety of solutions.
I have read
https://discussions.apple.com/message/16799039#16799039
https://discussions.apple.com/message/23474052#23474052
https://discussions.apple.com/message/19660884#19660884
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THIS IS THE FIX TO PUT THE VOLUME CONTROL BACK AT THE TOP!!!!!!
Carolyn SamitOct 17, 2014 1:35 PM Re: Where has the volume control moved to?
Re: Where has the volume control moved to?in response to mattzilla303
Hi ..
Open System Preferences > Sound then select any tab then click: Show volume in menu bar

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http://www.thehangtime.com/gb/gbfaq2.html#volumesliderdimmed
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I have post eariler on this forum and as you know I have the same problem, I have tried all the things listed here and nothing was perminant in fixing this painful iphone hating problem.... and failed. But I need to happily say that I now have the fix!!!! This worked for me and I fixed it by myself so you don't need to go to apple or service centre or anything.
Ok I like so many of you here truly believed this was as IO5 issue as it only dropped the sound on the speakers once that IO5 update came along. I tried a bunch of reset, reboots, home clicks, lock and unlocks, to fix this and all failed. some worked for an hour but then failed. hours of my life that I will never get back.   but since I have learnt this is not a IO5 problem but a hardware issue! ... and in paticualar is has to do with your bottom connection. Your phone is thinking it is docked all the time.
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