Muted Sound on Macbook Air

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Daniel R

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Hi,
My sound is muted on my new Macbook Air. I have tried to turn it up using buttons and also using headphones. In the top column the sound icon is grey and when I go into system preferences the "muted" button is checked and grey and I am also unable to un-check the box. I have included pictures. HELP!!!
Screen Shot 2016-08-26 at 1.31.52 PM.png
Screen Shot 2016-08-26 at 1.32.32 PM.png
 
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Daniel R

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I have added another picture of what happens when I try turning up the volume from the keyboard. Please help. Thanks.
Screen Shot 2016-08-26 at 10.16.56 PM.png
 

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