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Run A Hardware Check

If your Mac is behaving in an odd way, there may be an issue with some piece of the hardware -- such as the RAM.

You can perform a hardware check in order to chase down a diagnosis.

  • Shutdown your machine
  • Boot your machine
  • While it is booting, hold down the d key

At this point, the machine should have booted into a special hardware check mode. Select your preferred language, the hardware check will be performed, and any issues will be reported.

h/t Dillon Hafer