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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
Apple Service Diagnostics 3S151 MAC OSX Apple Service Diagnostics 3S151 MAC OSX 33bf5301e4 Apple Service Diagnostics (ASD) is distributed to Apple Service Providers. The Apple Service Diagnostics application is designed to run both. Berkeley Electronic Press Selected Works. Apple service diagnostics, apple service diagnostics download, apple service diagnostics list, apple service diagnostics 3s155 download, apple service diagnostics 3s138, apple service diagnostics 3s150, apple service diagnostics test, apple service diagnostics 3s162, apple service diagnostics 3s152, apple service diagnostics 3s149. Annex Apple Service Diagnostics is designed to run EFI and Mac OS X tests from external USB-carriers. Apple Service Diagnostics (EFI) performs direct low-level tests of hardware for Apple computers and requires no operating system, while Apple Service Diagnostics (OS) uses the Mac OS X to run these tests. ASD Dual Boot 2.1.5 (2003). After successfully entering the diagnostic mode, you will hear an audible chirp sound (3G models and higher), and the Apple logo should appear backward. Congratulations, you are now in Diagnostic Mode. Don’t worry, running these diagnostic tests will NOT damage or corrupt the data (music, photos, playlists, videos, etc.) on your iPod.
- 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.
Apple Service Diagnostics 3s138
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. 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
Apple Service Diagnostics
On an Intel-based Mac, if you can't start Apple Diagnostics with the D key, try these solutions:
Apple Service Diagnostic
- 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.