For SafeWizard I: The power switch is located on the power supply, which is connected to the plug that provides power to the safe. Restart your controller by sliding the power switch to the left to turn off and then to the right to turn on.
For SafeWizard II: The power switch is located on the bottom of the controller and is centered under the display. Restart your controller by sliding the power switch to the left to turn off and then to the right to turn on.