IBM x3400 7975 Problem Determination And Service Manual page 25

The following illustration shows the controls, LEDs, and connectors on the front of
the simple-swap server models.
System power LED
Power-control button
Front
information
panel
CD or DVD drive
activity LED
(green)
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.
System-error LED
When this amber LED is lit, it indicates that a system error has occurred.
An LED on the system board might also be lit to help isolate the error. See
Chapter 2, "Diagnostics," on page 17 for additional information.
USB connectors
Connect USB devices to these connectors.
Hard disk drive activity LED
System error LED
USB connectors
CD or DVD-eject button
7
Chapter 1. Introduction