Sound/Audio Suddenly Stopped Working On Older Mac Pro & Macbook Pro

I have a couple of older (High-Sierra) Apple products that I use for some non-essential tasks, for some reason after some kind of update the audio stopped working on both of them. After pulling my hair out for the past week trying to solve the issue I finally figured it out and wanted to post here with the solution in case anyone else runs into the same problem: **The Problem** - Computer updates and restarts (not sure what exactly is being updated...) - After restart no sound devices are working and the Sound section of System Preferences is inaccessible. **Everything I Tried (That Failed)** - Restarting/Shut-Down - Disk First-Aid - Booted to Safe Mode - PRAM and SMC reset - Terminal commands to restart coreaudiod - Reinstall of OS (Command-R on boot)