Coreaudiod Daemon missing -> No sound

UPDATE 4:

Turns out my sound card (or whatever it's called) was fried and needed to be replaced. Repair came at a cost of 14.000 JP¥ (about 130 U$D). Hopefully I listed everything you can do to restore sound on your mac before a costly trip to the Apple Store.

UPDATE 2:

I decided to go mess with the daemons (don't worry, I know what I'm doing). I found the .plist file for coreaudiod in the Launch Daemons folder.

I think the file was corrupted (?), anyways, I decided to replace the old daemon with a new .plist file containing the following (aka: new code for the coreaudio daemon):

I restarted the computer and the audio issue is still not resolved. AirPlay remains the only available sound output, jack port still not behaving properly, no sound through HDMI. How does this type of things happen?

UPDATE:

I just tried a force restart of the coreaudiod daemon with the following command (you need to disengage system integrity protection):

> sudo launchctl unload /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist &&
> sudo launchctl load /System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist &&
> echo 'Audio daemon restarted'

I got the following error message:

/System/Library/LaunchDaemons/com.apple.audio.coreaudiod.plist: Could not find specified service
-bash: Audio daemon restarted: command not found

I am now completely sure that the coreaudiod daemon was removed, which makes no sense as this is the first time I ever disengage system integrity protection on my device.

The question is: how do I get it back?

UPDATE 3:

I tried a couple of commands this morning to try and manually start the coreaudiod daemon.

Attempted with; 

> ls -ladeO /system/library/launchdaemons/com.apple.audio.coreaudiod.plist

no results (command unknown)

Attempted with: 

>start /system/library/launchdaemons/com.apple.audio.coreaudiod.plist

permission denied (system integrity protection already disengaged)

Tried re-setting permissions manually. No results, still haven’t found a way to enable myself to manually start launchdaemons. 

Tried manually forcing launchdaemon with: 

>sudo launchctl load /system/library/launchdaemons/com.apple.audio.coreaudiod.plist

Error: Invalid property list

I'm stuck here. I'll try running the above commands with the original daemon plist file, running them with the plist from another computer. Until now the issue persists. I'm going to another Apple Store see if they have an idea.