Press and hold the Power button until you see startup options, then press Command (⌘) + D .
If the D key fails, use Option (⌥) + D to download and run the test over the internet. download apple hardware test
Turn on your Mac and immediately press and hold the D key. Press and hold the Power button until you
This guide explains how to access, download, and use these diagnostic tools based on your Mac's age and processor type. and sensors for failure.
While "Apple Hardware Test" is the legacy name, the two terms are often used interchangeably to describe the process of checking your logic board, RAM, and sensors for failure.