How do I run a diagnostic on my IMAC 2010?
How do I run a diagnostic on my IMAC 2010? 1 Answer. Restart your system and hold the D key to launch the built-in diagnostics. How do you diagnose hardware in macOS? How to Use Apple Diagnostics to Check for Mac Hardware ProblemsPress the power button on your Mac and then immediately press and hold down the D key on the keyboard. ( Release the D key when the prompt appears on the screen asking you to choose your language using the arrow keys.Join a local Wi-Fi network if prompted. How do I troubleshoot my IMAC hardware? Apple siliconStart up...