![mac diagnostic tools from the 1970s mac diagnostic tools from the 1970s](https://m.media-amazon.com/images/I/81UIJyeVVrL._AC_SL1500_.jpg)
Mac diagnostic tools from the 1970s mac#
Reset System Management Controller (SMC): On iMac, Mac mini, or Mac Pro, disconnect power cable then press and hold the power button for 5 seconds to reset SMC.Wait for macOS Mojave to reset NVRAM and PRAM. Reset Non-Volatile RAM & Parameter RAM: Hard restart the Mac and instantly press and hold Option + Command + P + R keys until you hear the second chime.Issue 3: macOS Mojave Does Not Start/Boot Wait for a few seconds, and then press the power button to turn on the Mac. Hard Restart: If your Mac stops responding, then press and hold the power button until the device is forced shut down.Issue 2: macOS Mojave Stops Responding at the Startup Laptop Users: Connect the charger to your Mac and press the power button.Replace the faulty cord if required, then press the power button. Desktop Users: Check the power connection, switch, and the power cord.Issue 8: macOS Mojave Always Has Startup Issue.Issue 7: macOS Mojave Stuck in the Flashing Question Mark.Issue 6: macOS Mojave Stuck in the Gray Screen during Startup.Issue 5: macOS Mojave Crashes or Fails to Start.Issue 4: macOS Mojave Does Not Show Desktop after Startup.
![mac diagnostic tools from the 1970s mac diagnostic tools from the 1970s](https://cdn.osxdaily.com/wp-content/uploads/2017/11/run-apple-diagnostics-on-mac-6-610x472.jpeg)