![]() ![]() Write the reference codes down so you can share them with tech support later, if necessary. If Apple Diagnostics finds any issues it suggests solutions and provides reference codes. What to do if Apple Diagnostics reports an issue Once you’ve done that, you’ll see a bar showing the progress of the diagnostic tests, which should take only a few minutes. (If that doesn’t invoke Apple Diagnostics, try again, holding down Option-D to attempt to start Apple Diagnostics over the Internet.) Keep holding down until you see a screen asking you to choose your language. Once you’re ready turn your Mac on while holding down the D key. If you’re testing a laptop, make sure it’s on a flat, well-ventilated surface.Disconnect all external devices with the following exceptions: the keyboard and mouse or trackpad, display, Ethernet cable if you use it, and power adapter for laptops.If possible, pick a situation when the Mac is most likely to experience the problem (such as right after turning it on for the day, or when it’s unusually warm).If you have a firmware password enabled, turn it off before proceeding.It tests numerous internal subsystems in your Mac, including the CPU, memory, and firmware displays and graphics adapters connectivity via USB, Bluetooth, Wi-Fi, and Thunderbolt batteries and power adapters on laptops and more.īefore you run Apple Diagnostics prepare your Mac with these steps: (For Mac models released before June 2013 Apple included a similar set of diagnostics called Apple Hardware Test.)Īpple Diagnostics is a set of hardware test routines that Apple bakes into every Mac. "Cannot Read OS Version" from Composer captured OS.If your Mac is acting up and you suspect a hardware problem there’s an easy first step that you can and should try before calling for tech support: Apple Diagnostics.Change Add Packages/Certs to remember last location & not always change. ![]() ![]()
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