How To Run Diagnostics On Mac 14 Steps With Pictures

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You may need to disable your firmware password to start Apple Diagnostics. If Apple Diagnostics doesn’t start, reboot the computer and press ⌥ Option+D. The machine will try to start the diagnostics test online. Select your network connection, enter the password (if needed), and press the checkmark.

Some errors have multiple reference codes, so write down the reference code rather than just the problem summary. [1] X Research source If there are any hardware faults listed, schedule an appointment with Apple to get your computer repaired.

If you have a Mac without a CD drive, like a MacBook Air, insert the Software Reinstall USB drive into one of the computer’s USB ports. This is not necessary if you’re running OS X Lion or later. If your computer was released after July 2011 or you’ve updated your OS since then, it will either retrieve the Hardware Test from the hard disk or will download it from the internet.

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If Apple Hardware Test doesn’t start and your computer was released in 2011 or later, reboot the computer and press ⌥ Option+D to start the hardware test over the internet. Select your network connection, enter the password (if needed), and press the checkmark.

If you want the computer to check everything, check the box next to Perform extended testing (but be aware this will significantly increase the time it takes for the scan to complete).

Unlike with Apple Diagnostics, you will not get a specific reference code; it will just be technical jargon. If there are any hardware faults listed, schedule an appointment with Apple to get your computer repaired.