Caution - An immediate power-off might corrupt system data, therefore, use this procedure to power down the server only after attempting the graceful power down procedure.
When Main power is off, the System OK LED on the front panel begins blinking, indicating that the server is in Standby power mode. See Server System-Level Status Indicators.
Caution - When you power down the server using the On/Standby button, the server enters Standby power mode. Power is still directed to the service processor and power supply fans. To completely power off the server, you must disconnect the power cords from the power supplies.