Hold the "d" key during startup to boot up using the Apple Hardware Test (AHT) or Apple Diagnostics.This mode lets you use any Mac with a FireWire or Thunderbolt port as the source for your boot-up system. Hold the "t" key during startup to boot in Target Disk Mode.Hold the Option + "n" key to boot from the NetBoot default startup volume. ![]() NetBoot volumes can be created with OS X or macOS Server, allowing you to boot from, install the Mac OS, or restore the Mac OS from the server on your local network.
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