NEED HELP: No Sound / Audio "No Devices Found". Tried many solutions, none work

I have had this issue two months back, where my internal speakers just stopped working. I have tried all alternatives and what solved my problem was resetting SMC. This time around, I have been watching some videos when all of a sudden my laptop started acting really slow and was responding in delays for about 10-15 seconds and there was no sound. I quit Safari but that didn't help, so I restarted my laptop. After the restart, it keeps showing as "mute" whenever I try to increase/decrease the sound level.
I have tried the following:
Restarting
Inserting Headphones
Restarting again
Resetting PRAM
Resetting SMC
Deleting com.apple.BezelServices.plist
Shutting down coreaudiod in the Activity Monitor
Disabling Adobe Flash Player,
Re-installing OSX using the Command + R during startup
Also tried typing this in the Terminal:
sudo kextunload /System/Library/Extensions/AppleHDA.kext
sudo kextload /System/Library/Extensions/AppleHDA.kext
And restarting it another few times for a good measure.
I've got Mid-2012 Macbook Air and I do not have Boom.
This is getting pretty frustrating now.

Also tried typing this in the Terminal:
sudo kextunload /System/Library/Extensions/AppleHDA.kext
sudo kextload /System/Library/Extensions/AppleHDA.kext

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This question was solved.
View Solution.

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NEED HELP: No Sound / Audio "No Devices Found". Tried many solutions, none work

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