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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.
- The best Mac OS version is the one that your Mac is eligible to upgrade to. In 2021 it is macOS Big Sur. However, for users that need to run 32-bit apps on Mac, the best macOS is Mojave. Also, older Macs would benefit if upgraded at least to macOS Sierra for which Apple still releases security patches. How to Tell Which macOS You Are Running.
- Planning Your Route To OS 9: Vintage. The simplest and most direct way to run OS 9 applications is by booting into the OS natively on an older Mac such as an iBook G3 Clamshell, which can be picked up very cheaply - as in the cost of a night at the movies cheap.
Start Apple Diagnostics
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Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:
For Mac OS X 10.2 (Jaguar): set promenvbootargs to '. Start PearPC, wait and follow the instructions given by the installer. Eggsometric mac os. Click the Customize button, and uncheck Additional Print Drivers, Additional Asian Fonts, and Localized Files.
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.
To restart your Mac, click Restart or press R.
To shut down, click Shut Down or press S.
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. Long lad prototype mac os. Your Mac will restart to a webpage with more information. When you're done, choose Restart or Shut Down from the Apple menu.
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On an Intel-based Mac, if you can't start Apple Diagnostics with the D key, try these solutions:
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- 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.