- I have a MacBook Pro 13', Mid-2009 and it came with Mac OS X 10.6 Snow Leopard. As I understand it, that means I would have to use the DVDs provided by Apple to boot into Apple Hardware Test.
- Apple Diagnostics and Apple Hardware Test mode can help determine which hardware component may be causing the issue on your computer, and provide first steps to try and resolve it. On Mac computers introduced before June 2013, you will use Apple Hardware Test, an older version of Apple Diagnostics mode.
I have a MacBook Pro 8,2 early 2011 running Mavericks. I was unable to get Apple Hardware Test to run with the 'd' key held down at boot. This is because there is no Apple Hardware Test on these machines. To run AHT you must have a.diagnostics folder (containing the correct AHT files) here: /System/Library/Core Services/.diagnostics. Global Nav Open Menu Global Nav Close Menu; Apple; Shopping Bag +.
Most Mac users will experience years of using a Mac without any problems. But every so often, a hardware issue could surface that could significantly impact how your Mac performs.
Identifying the cause of problems — hardware or software — is the first step to fixing them. It could make a trip to an Apple Store or certified reseller easier knowing you've done all you can to identify and whenever possible, fix the problem yourself — saving you downtime and a potentially costly repair.
Built into every Mac is a way to run an Apple Hardware Test, also known as an Apple Diagnostics.
Hardware Tests are an effective way to identify the cause of a Mac performance problem, which could be CPU or GPU issue, a failing disk drive, an overloaded memory, a fan overheating, or any number of other potential faults. If you suspect it’s a hardware problem, Hardware Tests are the way to troubleshoot on Macs built before 2013. In newer models, those built after 2013, those same tests are labelled Apple Diagnostics.
How to Run Apple Diagnostics on any Mac
In some cases, a hardware problem is so severe that you won’t be able to switch your Mac back on. 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. Once you’ve got the instructions in front of you, Apple recommends going through the following process to diagnose a hardware problem:
- For those with iMacs or any desktop-based device: Disconnect all external drives and hardware devices, except for the keyboard, mouse, display, and speakers.
- Select Apple Menu > Restart.
- Press and hold the D key when the Mac is restarting.
- Apple Diagnostics will run automatically. When it is complete, it will present a list of the problems encountered.
Common Mac Hardware Issues
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.
Some of the most common hardware error codes indicate problems with:
- Wi-Fi — a failure of the AirPort wireless card (4AIR);
- Hard disk and SSD (4HDD)
- Logic board (4IRP)
- Memory — RAM (4MEM)
- External disk (4MHD)
- Fans (4MOT)
- Processor (4PRC)
- Video/graphics card (4YDC)
Apple Hardware Test Macbook Pro 2011 Download
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.
However, before you send your poor, unhealthy Mac off to the shop, there are several fixes you could try at home, such as resetting the PRAM or SMC. 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.
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.
Another way to improve Mac performance
What happens if you run a Mac diagnostics and it comes back with nothing? Does this mean you need to buy a new Mac? 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.
CleanMyMac X is designed to clear up junk, clutter and get your Mac back to peak performance. 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 2.5 billion gigabytes of data clogging up Macs all over the world.
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. Stay tuned!
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Using Apple Hardware Test on computers with OS X 10.7 or later
Mac NoteBook and Desktop computers shipping with OS X 10.7 or later have a partition on the hard drive or flash storage that contains AHT. To start AHT on these computers please follow these instructions:
- Press the power button to turn on your computer.
- Press and hold the D key before the gray startup screen appears.
- It takes a minute or so for AHT to start up and inspect your hardware configuration. While this is taking place, an icon appears on the screen:
- When the process is complete, select your language and click the right arrow. If you aren't using a mouse, you can use the up and down arrows to select a language and then press the Return key.
- The AHT console appears. You can choose which sort of test or tests to perform:
- To perform all of the basic tests, click the Test button or press the 'T' key or the Return key.
- To perform a more thorough diagnostic test, select the 'Perform extended testing' checkbox under the Test button before you click the Test button.
Note: Your test results will appear in the window in the bottom-right of the console. - To exit AHT, click Restart or Shut Down at the bottom of the window.
Some Macintosh computers that shipped with OS X Lion and later support the use of Apple Hardware Test over the Internet. These computers will start up to an Internet-based version of AHT if the hard drive does not contain AHT. An Internet-enabled connection via Ethernet or Wi-Fi is required to use this feature. Internet-based AHT functions the same as AHT on the hard drive or flash storage outlined above.
Macbook Pro Hardware Upgrades
The Mac NoteBook and Desktop computers listed in Computers that can be upgraded to use OS X Internet Recovery will require a firmware in order to support the Internet version of AHT. Without this update you may see the behavior discussed inthis article.
Apple Macbook Pro Review
Aug 9, 2013 4:28 PM