Apple Diagnostics or Apple Hardware Test mode
Apple Diagnostics or Apple Hardware Test mode?
Apple Diagnostics and Apple Hardware Test mode can help determine whichhardware component may be causing the issue on your computer, and providefirst steps to try and resolve it.On Mac computers introduced before June 2013, you will use Apple HardwareTest, an older version of Apple Diagnostics mode. Macs introduced after June2013 will use Apple Diagnostics mode instead.If your Mac’s hard drive or flash storage lacks Apple Diagnostics or AppleHardware Test, your computer will load their Internet-based counterpartsprovided your Mac is connected to the Internet via Ethernet or Wi-Fi.There’s no functional difference between local and Internet-based versions ofApple Diagnostics and Apple Hardware Test modes.
Booting Apple Hardware Test from macOS install disc
Older Macs with OS X Lion 10.7 and earlier that don’t have Apple Hardware Teston the startup disk can boot this feature from the Applications Install Disc 2or the MacBook Air Software Reinstall Drive which shipped with late-200MacBook Airs.Just insert the disc that came with your Mac into its built-in optical driveor an external Superdrive (owners of the late-2010 MacBook Air model willinsert the MacBook Air Software Reinstall Drive into a USB port) beforefollowing the steps outlined further below in this article.
How to start up your Mac in Apple Diagnostics or Apple Hardware Test mode
If you have a Mac notebook, double-check that the computer is connected to thepower adapter to prevent it from shutting down during testing. Additionally,unplug all external devices, including USB thumb drives and external storagedevices, from your Mac except the keyboard, mouse, display and Ethernetadapter.If you have an Internet connection, Apple Hardware Test or Apple Diagnosticswill upload results to Apple and recommend support resources on the company’ssupport website which are related to the detected issues.1) Select Shut Down in the Apple menu to turn off your Mac.2) Press the power button to turn on the computer.3) Immediately press and hold the D key on the built-in keyboard until AppleHardware Test or Apple Diagnostics begins inspecting your hardwareconfiguration, which may take a minute or so.Tip: To start Apple Diagnostics or Apple Hardware Test over the Internet,press the Option (⌥) – D key combination.4) Now select your desired language for Apple Diagnostics or Apple HardwareTest and click the right arrow, or press the Return key.5) Choose which sort of tests you wish to perform. You can perform basic testsby clicking the Test button, or run a barrage of detailed diagnostic test byticking the box next to “Perform extended testing” and then hitting the Testbutton.6) Test results will appear after a few minutes. As the tests are performed,your Mac notebook’s fan may kick into overdrive. If there’s something wrongwith your computer, you’ll get a brief description along with a referencecode.If no issues are found, a “No issues found” message appears. Apple Diagnosticsreference codes are explained in the last section.7) To exit Apple Diagnostics or Apple Hardware Test mode, click Restart orShut Down button.
Keyboard shortcuts in Apple Diagnostics and Apple Hardware Test
You can use the following keyboard shortcuts to enter Apple Diagnostics orApple Hardware Test and select its features. * D at boot time—Start Apple Diagnostics or Apple Hardware Test * Option (⌥) – D at boot time—Start Apple Diagnostics or Apple Hardware Test over the Internet * Command (⌘) – G—Get started (loads in Recovery mode) * Command (⌘) – L—Display the language selection screen * Command (⌘) – R—Run this test again * S—Shut down your Mac * R—Restart your MacRELATED: Ten handy keyboard shortcuts to help you navigate FinderTip: If Apple Diagnostics or Apple Hardware Test is in progress and you pressR on the keyboard or click the Restart button, there may be a 10 to 20 seconddelay.
Error codes generated in Apple Diagnostics or Apple Hardware Test
If Apple Diagnostics or Apple Hardware Test isolate a hardware issue with yourcomputer, you will get an error code.You will need this code to learn more about what might be wrong with yourcomputer and how to troubleshoot the issue. In addition, these codes arerequired if you contact Apple or take your Mac to an Apple Authorized ServiceProvider or Apple Retail Store to determine which service and support optionsare available.For instance, the reference code “ADP000” means that no issues have been foundwhile the “NDL001” code denotes a possible issue with the Bluetooth hardware.The diagnostic reference codes produced by Apple Diagnostics or Apple HardwareTest are listed in this Apple support document.
Use Apple Diagnostics to test your Mac
Apple Diagnostics, formerly known as Apple Hardware Test, can check your Macfor hardware issues.If you think your Mac may have a hardware issue, you can use Apple Diagnosticsto help determine which hardware component might be at fault. AppleDiagnostics also suggests solutions and helps you contact Apple Support forassistance.
Use Apple Diagnostics to test your Mac
Apple Diagnostics, formerly known as Apple Hardware Test, can check your Macfor hardware issues.If you think your Mac might have a hardware issue, you can use AppleDiagnostics to help determine which hardware component might be at fault.Apple Diagnostics also suggests solutions and helps you contact Apple Supportfor assistance.
Start Mac in Apple Diagnostics or Apple Hardware Test mode
Macintosh Diagnostics and Apple Hardware Test mode can help make sense ofwhich hardware component may be causing the issue on your PC, and givebeginning strides to endeavor and resolve it.On Mac PCs introduced before June 2013, you will use Apple Hardware Test, amore settled version of Apple Diagnostics mode. Macs exhibited after June 2013will use Apple Diagnostics mode.If your Mac’s hard drive or flash storing needs Apple Diagnostics or AppleHardware Test, your PC will stack their Internet-based accomplices gave yourMac is connected to the Internet by methods for Ethernet or Wi-Fi.There’s no functional distinction amongst neighborhood and Internet-basedversions of Apple Diagnostics and Apple Hardware Test modes.
How to Run Apple Diagnostics on Mac to Test for Hardware Issues
1. Disconnect all devices and cables connected to the Mac that are not required for it to function (i.e.; keyboard, mouse, external display, power cable) 2. Shut down the Mac by going to the Apple menu and choosing “Shut Down” 3. Turn on the Mac by pressing the Power button, then immediately press and hold the “D” key on the keyboard 4. Continue holding the “D” key until you see a screen asking you to select your language, then click on your language choice to proceed 5. Apple Diagnostics will run a series of hardware tests on the Mac, displaying a progress bar on the screen with an estimated time remaining and a “Checking your Mac…” message, this usually takes a few minutes to complete 6. When finished, the Mac will report any issues that are found and show a reference code* if applicable 7. You can run the Apple Diagnostic test again by clicking “Run the test again” if desired, otherwise you can choose the “Get Started” support option, “Restart” option, or “Shut Down” optionThere are many potential error messages that may show up in Apple Diagnostics,and if you’re not sure what to make of them you can check them with the Applediagnostic code list discussed further below, or contact Apple directly forsupport options.Keep in mind that not every single hardware issue is going to show up or beflagged by Apple Diagnostics. Some more unusual hardware problems may not bediscovered by the Apple Diagnostic tool included on Mac, and would need tohave additional troubleshooting and discovery tests run by an authorized Appletechnician. This can include unusual behavior like a computer that won’t startrandomly, or a Mac that randomly shuts down, or some problems with ports orthe internal display. Also, any physical damage to the Mac will not show up inApple Diagnostics, so if your Mac has a big dent in the size or a crackedscreen, that will not show up in the hardware test. Neither will somethinglike drying a Mac after the Mac has sustained water or liquid contact, unlessthe water contact actually damaged something that is then detectable in thediagnostic test. For this reason, the Apple Diagnostic test is not perfect,but it’s a great starting point for end consumers to begin troubleshootingsome particularly annoying hardware problems on a Mac, iMac, MacBook, MacBookPro, or other modern Macintosh computer.
How do I interpret Apple Diagnostics references codes from a Mac?
If Apple Diagnostics reports a potential issue, it will provide a referencediagnostic code and a brief explanation of what the issue pertains to. You canthen get further information by making note of the Apple Diagnostics referencecode number and checking the Apple Reference Codes page here for additionalinformation. This is a helpful resource and should assist you introubleshooting a hardware problem.
Going Further with Apple Diagnostics and Troubleshooting Mac Hardware
Remember, the Apple Diagnostics tool is helpful, but it is not definitive. Ifyou are experiencing problems on a Mac that seem to be clearly related to ahardware problem, you will probably want to do the following:The good news is that hardware problems are rare, and most hardware problemsare fixable. In fact, many hardware issues will be covered by the Applewarranty or Applecare Extended Warranty, meaning a repair would be free ofcharge, as long as the problem is not not from damage or user-caused behavior.
How to use Apple Diagnostics to detect Mac hardware problems
This is very easy to use. As mentioned earlier, you do not need any third-party software since this is an inbuilt tool that comes with every Maccomputer. No matter if you are using the latest version of macOS or an oldedition, you can certainly find it in your computer.To get started, unplug all the external devices including an externalkeyboard, mouse, USB drive, etc. Put your computer on a flat surface and plugthe charging cable. If you do not want to get diagnose the charging-relatedissue, you can unplug the charging cable.After that, turn off your computer. Now, press the “D” button and then, tapthe Power button to turn on your Mac computer. It will show you a screen thatlooks like this-If you do not have any problem, you cannot find anything, and it will ask youto keep using your computer. However, if you get any error message on yourscreen, this is recommended to repeat the whole process again. Sometimes, itcan show false positive. If you are getting the same issue in the second time,it should look like this-As mentioned earlier, you can find reference codes on your screen. Thefollowing list contains some reference codes and their definition.