IBM x3400 Installation Guide - Page 52
Power-on, Power-control, button, drive, activity - manual
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The following illustration shows the controls, LEDs, and connectors on the front of the simple-swap server models. System power LED Power-control button Hard disk drive activity LED System error LED Front information panel CD or DVD drive activity LED (green) USB connectors CD or DVD-eject button Power-on LED When this LED is lit, it indicates that the server is turned on. When this LED is off, it indicates that ac power is not present, or the power supply or the LED itself has failed. Note: If this LED is off, it does not mean that there is no electrical power in the server. The LED might be burned out. To remove all electrical power from the server, you must disconnect the power cords from the electrical outlets. Power-control button Press this button to turn the server on and off manually. Hard disk drive activity LED When this LED is flashing, it indicates that a hard disk drive is in use. 38 System x3400 Types 7973, 7974, 7975, and 7976: Installation Guide