Can't get sound on My MacBook Air, Shows No Audio Device. How do I fix this?

I have a MacBook Air that I receved from a relative, it is beyond it's warantee period.
Today, while on my MacBook Air, the sound suddenly stopped
I went into System Preferences, and when I click on Audio, it shows the sound as muted, but doesn't allow me to unmute the sound
When I went into System Profiler, it is showing under Audio (Built-in): Intel High Definition Audio: Audio ID - 0
no Audio Device
How do I fix this and hear My sounds again?
Thank you in advance

i got same problem too but it's 2011 macbook pro 10.6.8 also SD card out of order as well and it's horrible computer I ever have. no more mac

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