How to use Apple Hardware Test

How to use Apple Diagnostics Disconnect all external devices except keyboard, mouse, display, Ethernet connection if applicable , and connection to AC power. Make sure that your Mac is on a hard, flat, stable surface with good ventilation. Shut down your Mac. Turn on your Mac , then immediately press and hold the D key on your keyboard. Keep holding until you see a screen asking you to choose your language.

When Apple Diagnostics knows your language, it displays a progress bar indicating that it's checking your Mac: Checking your Mac takes 2 or 3 minutes. Note the reference codes before continuing. There's really only one application that comes to mind for this: The "basic" and "extreme" presets can be used, but a "custom" option is also available that really lets you go all out.


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The test will render game scenes at the quality and resolution you set; a higher quality and resolution will mean more work for your GPU and thus a better stress test. You will have to re-start the test when it finishes to get a few loops out of it the free version , but at insanely high settings your GPU will probably take a long time to finish a single run anyway. There are utilities that can read out and test these sensors, but only Apple and their Diagnostics really know what the correct value ranges are and if a sensor passes or fails a test. However, if you'd like to take a closer look at the sensors to make sure their measurements are what you want them to be, or just to satisfy your curiosity, there are a few options available.

A lot of continuous checking is going on inside your Mac to make sure all these readings are what they should be, and while you typically never need to know these readings, they can help you verify your Mac's hardware is working properly. The one application that can read out all these sensors is TechTool Pro.

It is a pretty comprehensive system test suite that includes sensor testing. We've covered pretty much all the internal components of your Mac, but there are a few things that are often overlooked in system testing. These are as follows:. If there is an issue with your mouse or trackpad, you will find out during normal use, so I won't suggest any tests for those. The same goes for the hinges of your laptop screen.

The one thing I have not covered in this article is your Mac's cooling system.

If your Mac survived all of the above stress tests without suddenly shutting down or bursting into flames, it's safe to say your cooling system is good to go. However, there is a big difference in keeping a system cool enough to keep it from overheating and keeping it cool enough to make it last. The cooling system is more than just the fan s , it also involves heatsinks, thermal paste, thermal pads and airflow.

For now, to keep your Mac running nice and cool, open it up and clean out the dust.

How to Use Apple Diagnostics on Mac to Identify & Troubleshoot Hardware Problems

Take the proper ESD precautions and go as far as you're comfortable with taking your Mac apart. Mac Pro users are probably not new to this, but most laptop users likely will be. For laptops, it's typically enough to remove the bottom cover and carefully blow out the dust from the boards, fan s and heatsinks. More airflow results in a cooler Mac. You've done it! The CPU, GPU and RAM tests mentioned in this article go far beyond what even the diagnostics at Apple will do, so if your Mac passed them all with flying colors, I have no doubt it can handle whatever workload you throw at it.

How to Perform Apple Diagnostics to Uncover and Fix Hardware Problems

OK, I admit, I just like to see my Macs break a good sweat once in a while for no good reason. Knowing your Mac can handle even the hardest work is a good feeling. There are so many people out there using just a fraction of their Mac's power for fear they might crash it or it runs too hot. Your Mac is not a delicate flower, it's a powerful number cruncher and even if you only use it to check Facebook or work on a Pages document, it's nice to know it can handle an afternoon of RAW photo editing or a Final Cut Pro montage of your niece's graduation when needed.

Most of you will probably agree that you'd rather have the power and not need it, than need it and not have the power. Have something to say about this story? Did you run all these hardware tests on your Mac? It's Ok to boast, let us know how your Mac performed in the comments below! Follow IntegoSecurity. The Mac Security Blog. Search for: Whether you are running an Apple diagnostics on newer hardware and OS X devices or a Mac hardware test on older devices , Apple recommends printing their support instructions on how to run these tests.

How to Test Your Mac

At this point, you can either follow on-screen instructions or contact Apple Support — arranging a Genius Bar appointment — or go to an Apple Authorized Service Provider to make repairs, to fix the problems. Make a note of any reference codes. Most Mac error codes suggest a failure of the component they reference, or a related component that is causing a problem with the hardware. In most cases, an Apple specialist or technician may be needed to resolve this issue. This can fix some of the most common errors, including problems with the logic board and fan.

Disk Utility built-into every OS X is useful for fixing memory RAM , hard disk and external drive problems, as are several third-party apps.

How to use Apple Hardware Test on your Mac

For those with older Macs, when you are running an OS X Hardware Test, an alert message will appear once complete with a list of the problems encountered. Again, you have the option of following on-screen instructions to restore the Mac, or re-booting the device using a startup disk, or taking the Mac to a store or Authorized Service Provider.

In any scenario involving hardware, you need to be aware that you are at risk of losing any items on your Mac that haven't been backed-up to the cloud.


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  • We recommend storing as much as you can with a cloud provider, such as Dropbox, or Apple iCloud. What happens if you run a Mac diagnostics and it comes back with nothing? Does this mean you need to buy a new Mac?


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