To Boot into Safe Mode on a Windows computer, follow these steps

  1. Be sure you computer is shut down.
  2. Press the power button.
  3. Immediately after seeing the initial bootscreen, begin pressing the  key repeatedly.
  4. Continue pressing  until the safe mode bootscreen appears.
  5. If successful, choose the type of Safe Mode to boot in.
  6. Your computer will now boot in safe mode until you restart your computer.

Alternative (if the above steps did not work)

  1. Turn on your computer and login to Windows.
  2.  System Configuration options (type “msconfig” via the Start menu or using the Run application).
  3. Once System Configuration has opened, select the Boot tab at the top.
  4. Check the “Safe boot” checkbox located in the boot options area.
  5. Next select the Network radio button to enable networking.
  6. Click OK and restart.
  7. Follow the steps above to no longer boot into Safe Mode.

To Boot Into Safe Mode (to Safe Boot) on a Macintosh, follow these steps

  1. Be sure your Mac is shut down.
  2. Press the power button.
  3. Immediately after you hear the startup tone, hold the <Shift> key.
  4. The <Shift> key should be held as soon as possible after the startup tone, but not before the tone.
  5. Release the <Shift> key when you see the gray Apple logo and the progress indicator (looks like a spinning gear).

Alternative (command line)

  1. Open the Terminal application.
  2. Execute the following command in Terminal:

    sudo nvram boot-args=”-x”

  3. Execute the following command to no longer boot into Safe Mode:

    sudo nvram boot-args=””

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Safe Mode is useful for troubleshooting problems with programs and drivers that might not start correctly, or that might prevent Windows from starting correctly. Allowing you to eliminate the default settings and basic device drivers.

Safe Mode by default will enable the default administrator account. If this is the case, login by typing “Administrator” as the username and leaving the password field blank.

Safe Mode is a way to start up your Mac that performs certain checks and prevents certain software from automatically loading or opening.

Starting up in Safe Mode on a Mac does several things:

  • Forces a check of the startup volume, just like the First Aid feature of Disk Utility
  • Loads only required kernel extensions
  • Disables all fonts installed by the user
  • Moves font caches to the Trash that are stored in /Library/Caches/com.apple.ATS/(uid)/
  • Disables all startup items and login items in macOS 10.4 or later.

Taken together, these changes can help resolve or isolate certain issues that exist on the startup volume.

In macOS 10.3.9 or earlier, Safe Mode opens only Apple-installed startup items (such items may be installed either in /Library/StartupItems or in /System/Library/StartupItems). These items are different from user-selected account login items.