Save your data and close any open applications.
Use one of the following power-off options:
Use the operating system shutdown command or menu option.
To avoid data loss, use the first option whenever possible.
If the first step does not shut off the workstation power, press and hold the Power button for approximately four seconds.
If the preceding options do not power off the workstation, turn the power switch on the back panel to the Off ( 0 ) position.
After powering off the workstation, wait at least 10 seconds before powering on the workstation again.