Audio Controller Dead?

[DT523]

A buddy of mine has a MacBook Air (late 2013) A1466. About 2 days ago, the audio was fine. Now it won't recognize the audio devices at all and there's a loud feedback sound when you plug in headphones. He is a Fire Chief and he uses this for presentations, so he definitely needs audio back. Any ideas?

 

[yourilevoye]

tried to conect audio via usb?
For example: I have a external mic that conects via USB. I can plug in my earpods directly into the mic. Maybe try something like that? Then u know if it is the audio card of the laptop or something else.

 

[DT523]

I don't have USB audio device. The speakers also don't work, forgot to mention that. But when I connect via HDMI, it will recognize and use the audio travelling on that