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Good evening, Everything on my El Capitan installation seems to be working fine, except audio. Ideally, I'd like HDMI audio, but I don't even have onboard audio (headphones don't work in any of the ports). I've looked at a few guides, but none of them have worked for me. I attached a screen...

Is there any way to remove the changes I made? It booted just fine before this (although the USB thumb drive had to be in.) I hear about ktexts to better change what you need fixed (but I don't know how to apply them). In my case, HDMI audio is the only identifiable issue I had before trying...