Insights into building a solid I.T. foundation in the mid-size business world.

Restoring Apple Hardware Test

If you find that you’re unable to boot your Mac in to Apple Hardware Test (by holding down the ‘D’ key during startup), you can restore it by downloading the correct version for your system here and then copying the hidden /System/Library/Coreservices/.diagnostics directory to the same location on your system.

Also! Just discovered the Internet Recovery tool, available at boot while holding down Option-D!

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