Accessing Mac Hardware Diagnostics Mode

If something is wrong with your Mac, either you or the tech repairing your Mac will need to access the special diagnostics mode. You can do this by restarting your Mac and holding the D key. The results could give you some insight into the problem. See for details.

Here’s Apple’s official page: How to use Apple Diagnostics on your Mac

Comments: One Response to “Accessing Mac Hardware Diagnostics Mode”

    7 years ago

    This 13in MacBook (circa 2010) does not respond to holding down the "D" Key on startup. Also tried usual combinations Option + D and so on with no result.
    Thanks anyway for other useful stuff.

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