Apple Diagnostics will run a suite of tests on the Mac to check for hardware issues – meaning, not a problem with system software, but instead it searches for trouble with some sort of hardware component on the Macintosh. Run Apple Hardware Test. If your clean Mac is still slow, then it’s time to try a Mac hardware test. This test, developed by Apple, will diagnose your system for any hardware faults. Sort of like Sherlock Holmes working on a crime scene, only the crime scene is your misbehaving Mac.
If you think your Mac might have a hardware issue, you can use Apple Diagnostics to help determine which hardware component might be at fault. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance.
Prepare your Mac
- Shut down your Mac.
- 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.
Start Apple Diagnostics
Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
Apple silicon
- Turn on your Mac and continue to press and hold the power button as your Mac starts up.
- Release when you see the startup options window, which includes a gear icon labeled Options.
- Press Command (⌘)-D on your keyboard.
Intel processor
- Turn on your Mac, then immediately press and hold the D key on your keyboard as your Mac starts up.
- Release when you see a progress bar or you're asked to choose a language.
View the test results
Apple Diagnostics shows a progress bar while it's checking your Mac:
When testing is complete, Apple Diagnostics shows the results, including one or more reference codes. Learn about Apple Diagnostics reference codes.
To repeat the test, click “Run the test again” or press Command-R. |hotstar| free pulp fiction 1994 movie download in hd quality.
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To restart your Mac, click Restart or press R.
To shut down, click Shut Down or press S. Prs ce serial numbers decoder download.
To get information about your service and support options, make sure that your Mac is connected to the internet, then click ”Get started” or press Command-G. Your Mac will restart to a webpage with more information. When you're done, choose Restart or Shut Down from the Apple menu.
Learn more
![Old Old](/uploads/1/1/8/7/118722129/557370178.jpg)
On an Intel-based Mac, if you can't start Apple Diagnostics with the D key, try these solutions:
- Press and hold Option-D at startup to use Apple Diagnostics over the internet.
- Make sure that your Mac isn't using a firmware password.
This article applies to you only if you have an old Mac that was released before June 2013. Yes, this article is about old hardware that is still out there. It is even still traded on ebay for exmaple. So I am pleased to announce AHT Fix. The tiny app restores the Apple Hardware Test on older Macs (released before June 2013) where Mac OS X, OS X or macOS has been reinstalled from scratch. Please also have a look at the 'Implementation details and credits' in this article.
The Problem
„Apple Hardware Test (AHT) contains a suite of diagnostics that will test the hardware of your computer. […] If your Mac was released after June 2013, you will use Apple Diagnostics rather than Apple Hardware Test (AHT).“ See also https://support.apple.com/en-us/HT201257
If you have reinstalled an older Mac from scratch, the diagnostic tools might no longer be available. If there is content in /System/Library/CoreServices/.diagnostics you are affected. Unless you have the original disks that came with your Mac, there seems to be no way to restore the AHT.
The Solution
AHT Fix. You can grab a copy from https://github.com/jonelo/ahtfix
The application will determine the model of your Mac, query an Apple server, download the appropriate AHT binaries and restore it on your Mac. And once restored you just need to follow the instructions at https://support.apple.com/en-us/HT201257 in order to perform all hardware diagnostics on your Mac.
Note: Starting with El Capitan (OS X 10.11) there is a new feature called System Integrity Protection (SIP) that prevents the modificaiton of a number of operating sytem directories by default.
In order to use AHTFix on El Capitan and later you have to disable SIP temporarily.
![Mac Hardware Diagnostic Tool For Old Mac Mac Hardware Diagnostic Tool For Old Mac](/uploads/1/1/8/7/118722129/471250857.jpg)
Mac Hardware Diagnostic Tool For Old Machinery
See also https://www.macworld.com/article/2986118/security/how-to-modify-system-integrity-protection-in-el-capitan.htmlSystem Requirements
- A Mac, released before June 2013
- Mac OS X 10.6 or later
- SIP disabled if you run El Capitan (OS X 10.11) or later
- An internet connection (any bandwidth)
Implementation details and credits
On https://github.com/upekkha/AppleHardwareTest you find detailed instructions from Claude Becker how to restore the AHT manually. I put those instructions (and a few more) to a bash script so that you can restore the AHT in a comfortable way.
I also would like to thank Apple for hosting the AHT binaries on their servers. That really helps users to restore the AHT on Macs that would be otherwise incomplete.
I also would like to thank Apple for hosting the AHT binaries on their servers. That really helps users to restore the AHT on Macs that would be otherwise incomplete.