Troubleshooting 101 -- at its core -- involves identifying a problem on a computer and using that information to resolve any issue(s) stemming from said problem. While most troubleshooting takes place at the OS level, there will inevitably come a time when the hardware itself will be the cause of a system's instability. Many 3rd-party tools exist to root out hardware trouble, sometimes heuristically, even before the component has failed. But many Mac owners do not know that Apple bakes in a utility specifically to test hardware found in Apple computers of all sizes. There are two utilities, as a matter of fact, and depending on when your device was manufactured, you'll access Apple Hardware Test if your computer was manufactured prior to June 2013. If the computer was manufactured after that date, then Apple Diagnostics is the utility that will load. They're both very similar in what they accomplish -- a self test of the hardware, complete with scans of in...
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