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On an Intel-based Mac, if you can't start Apple Diagnostics with the D key, try these solutions: (1) Press and hold Option-D at startup to use Apple Diagnostics over the internet. (2) Make sure that your Mac isn't using a firmware password. Published Date: November 20, 2020: Use Apple Diagnostics to test your Mac
A bunch of screws not listed have to be removed also they are in proximity of the cmos battery I imagine someone will damage their machine following this NOT GOOD! I signed up just to post this! Look for screws with the LETTER B they need removing before the board can come out! ifixit should screen their submissions better