Turn on your Mac and continue to press and hold the power button as your Mac starts up. Make sure that your Mac is on a hard, flat and stable surface with good ventilation.ĭetermine whether you're using a Mac with Apple silicon, then follow the appropriate steps:. Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable) and connection to mains power. Apple Diagnostics also suggests solutions and helps you contact Apple Support for assistance. 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. Perhaps my Terminal commands are wrong?Īs per Apple recommendation: Use Apple Diagnostics to test your Mac – Apple Support (AU)Īpple Diagnostics, formerly known as Apple Hardware Test, can check your Mac for hardware issues. I haven't been able to place this "invisible" file the the folder. 
Several Terminal attempts to move this file also fail diagnostics folder in System/Library/CoreServices, so after determining the model and board ID,Ĭommand-Shift-Dot reveals the. Tried again using option-D during restart, same result.
Result:Įrror: 0x8000000000000003, Cannot load 'EFI/Driver/TestSupport.efi'Įthernet cable connected. While on wifi, I tried to run Apple Hardware Test with a restart while pressing D and it would not load. I ran Safe Boot, and First Aid from Disk Utility, SMART status was verified. It could not put some simple screenshots in the trash. Sometimes Finder windows will leave the topmost item out of reach unless the window is expanded. Cannot run Apple Hardware Test, MBPr, High Sierra 10.13.6 My MBPr has been acting a bit funky lately.
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