Apple Diagnostics, formerly known as Apple Hardware Test, is a valuable tool for identifying hardware problems on your Mac. Understanding and interpreting the resulting Mack Diagnostic Codes can help pinpoint the issue and guide you towards a solution. This article explains how to run Apple Diagnostics and understand the codes it generates.
Running Apple Diagnostics on Your Mac
Before initiating the diagnostic test, prepare your Mac:
- Update macOS: If possible, install the latest macOS updates.
- Shut Down: Completely shut down your Mac.
- Disconnect Peripherals: Disconnect all external devices except the keyboard, mouse, display, Ethernet connection (if needed), and power adapter.
- Stable Surface: Place your Mac on a hard, flat, stable surface with good ventilation.
The process for running Apple Diagnostics differs depending on whether your Mac uses Apple silicon or an Intel processor:
Apple Silicon Macs
- Power Button: Press and hold the power button until startup options appear.
- Command-D: Press and hold Command (⌘) and D keys.
Intel Processor Macs
- D Key: Turn on your Mac and immediately press and hold the D key. Release when the progress bar appears or you’re prompted to choose a language.
- Option-D: If the D key doesn’t work, try Option (⌥) and D keys at startup. This requires an internet connection.
You might be asked to select a language and ensure an active internet connection. Use the Wi-Fi menu in the top-right corner to connect to a network if needed.
Interpreting Mack Diagnostic Codes
After the test completes, Apple Diagnostics displays results, including one or more reference codes, often referred to as Mack diagnostic codes. These codes provide clues about the potential hardware problem.
For example, a code like “ADP000” indicates no issues found. However, other codes point to specific hardware components, such as problems with the logic board, memory, or sensors.
Refer to Apple’s official documentation for a comprehensive list of Mack diagnostic codes and their meanings: List of Apple Diagnostics reference codes.
Next Steps After Diagnosis
After obtaining the Mack diagnostic codes:
- Repeat Test: Click “Run the test again” (Command-R) to verify the results.
- Restart/Shutdown: Click “Restart” (R) or “Shut Down” (S) as needed.
- Get Support: If a hardware issue is confirmed, click “Get started” (Command-G) to access Apple’s support resources online. This requires an internet connection.
By understanding Mack diagnostic codes, you can take proactive steps to address hardware issues on your Mac and seek appropriate assistance when necessary.
