Now perform the following actions:. If your system loads the tests, then for older systems you will see a small image of a computer and a processor chip appear on your screen, followed by an option to choose your language.
If this does not appear and the system boots normally, then the tests were not properly loaded. When you have chosen a language, then the hardware tests will load. Below this button is a checkbox for enabling the extended memory tests, which will scan your installed RAM in great depth. This option may take hours to complete, but is a recommended step to take anytime you have purchased a new system even brand new from Apple , or have installed new RAM into your system.
When you click the Test button, a progress bar will appear and show you the time remaining for the tests. When this finishes, the system will show you the results of the test.
Hopefully the tests determine your system is clean and functioning properly; however, if not, then they will display an error code such as the following, to indicate a problem:. While this code might seem unintelligible, parts of it can be broken down to determine where the problem lies. The following list of codes show the possible outputs that you might see from the hardware test:. The results of the hardware test, if any, will show here click for larger view.
Now you can determine which of these is the case by looking at the final detail of the reading TL0P The following list is a breakdown of what each of these components is:. From this detail, we can see the example problem is with a temperature sensor in the LCD display of a MacBook system. Unfortunately with hardware errors, there is often not much you can do except take the system in to an Apple store to have parts replaced. While some components such as memory and hard drives are user-serviceable in some Macs and can be swapped out, for other components this is not easy to do.
Otherwise, if the problem is with a Wi-Fi card or optical drive then you can try opening the system to see if relevant components have become dislodged, and then reseat them.
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If you are unable to perform these tasks, or feel uncomfortable with opening your system, then take it in to an Apple Store or an authorized Apple Service Center for servicing. They are different. As for the memory test, I am not sure which is more thorough, but sometimes one may find a problem where another one fails, so I often recommend to use multiple test suites for checking RAM.
Apple Hardware Test or Apple Diagnostics?
My current Macbook Pro was originally purchased with Snow Leopard installed. It now has Mavericks. I still have the Would you suggest for or against using it to perform this diagnostic with The hardware diagnostics tests are separate from the operating system. The one on your What if you cant get any errors from AHT? Hey Topher, on my MacPro the power light flashes and it never gets to the chime.
So no booting at all until I took out 6 of my 8 4GB sticks and it starts up fine. How do I determine which of the other 6 are bad? This suggests a motor problem MOT with your hard drive. Thankfully, if you can run an Apple Diagnostics or Hardware Test, Apple Support suggests this is a way you can restart your Mac, even if it refuses to switch back on through other means. 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.
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 to Diagnose Mac Problems
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.
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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Or give up using Mac altogether, switching to another device and operating system? An Apple Diagnostics or Hardware Test that reports a lack of problems indicates it could be a software issue. Another alternative worth exploring, especially if your Mac is overheating or slowing down, is that your storage is too full of junk, clutter, applications, and duplicate files and photos.
On average, Mac users have 62GB of data, files, apps, and images they do not need. Too many files slow down and overheat computers, making them difficult to use and causing them to crash more often. With over 4 million downloads and hundreds of positive reviews, we know that CleanMyMac X has carefully removed over 11 million unnecessary apps and over 2. With two click removals, you can quickly clean loads of data, making your Mac easier to use and freeing up space for new documents, downloads and images.
Once you've run a Hardware Test or Apple Diagnostics, use CleanMyMac X it's free to try to identify and fix any other issues that are causing your Mac to run slowly or overheat. We hope this article was helpful and you found the answers to all your questions here.