Apple Diagnostics/Hardware test not working on MacOS11.3

Hi, can anyone help verify this, or suggest a fix? Since updating to 11.3 today, I cannot use Apple Diagnostics by holding D on startup. I get into Diagnostics, select my language, but then it is just a black screen with no testing taking place. It work previously on 11.2.

MacBook Pro 16″, macOS 11.3

Posted on Apr 27, 2021 5:12 AM

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Question marked as Top-ranking reply

Posted on Apr 29, 2021 7:54 AM

If it is attempting to Run the on-line version - will need an active Internet Connection either by Ethernet Cable to Router of over Active Wifi connection.


Use Apple Diagnostics to test your Mac

Prepare your Mac

  1. Shut down your Mac.
  2. Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
  3. Make sure that your Mac is on a hard, flat, stable surface with good ventilation.


4 replies
Question marked as Top-ranking reply

Apr 29, 2021 7:54 AM in response to ACPLE

If it is attempting to Run the on-line version - will need an active Internet Connection either by Ethernet Cable to Router of over Active Wifi connection.


Use Apple Diagnostics to test your Mac

Prepare your Mac

  1. Shut down your Mac.
  2. Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power.
  3. Make sure that your Mac is on a hard, flat, stable surface with good ventilation.


Apr 28, 2021 10:30 AM in response to ACPLE

Hello there ACPLE,



We see that Apple Diagnostics aren't working when you try to use it. Let's take a closer look as we do our best to provide some additional insight.


To get started, what exact model of Mac are you using, and what issue are you troubleshooting that requires using diagnostics? This can be helpful in case you may have a hardware issue preventing the use of diagnostics to begin with.


Next, are you still able to start up your Mac like normal or using safe mode? Start up your Mac in safe mode



Certainly keep us posted, we’re here for you every step of the way!


Take care.


May 1, 2021 12:12 AM in response to Owl-53

Well the problem occurs with the online or offline version. Of course I've got an active internet connection. As per first post I know how to use diagnostics, I'm just reporting that I'm finding an issue with it after upgrading to MacOS 11.3, and on the same machines it wasn't an issue on 11.2 previously.

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Apple Diagnostics/Hardware test not working on MacOS11.3

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