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Chapter 3. Server controls, LEDs, and power
This chapter describes the controls and light-emitting diodes (LEDs) and how to
turn the server on and off.
Front view
The following illustration shows the controls, light-emitting diodes (LEDs), and
connectors on the front of the server.
1 Power-on LED 6 System Error LED
2 Power-control button 7 USB 1 connector
3 Reset button 8 USB 2 connector
4 Hard-disk-drive activity LED 9 CD drive activity LED
5 Locator LED 10 CD-eject button
Power-on LED: When this LED is lit and not flashing, it indicates that the server is
turned on. When this LED is flashing, it indicates that the server is turned off and
still connected to an ac power source. 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 cord from the electrical outlet.
Power-control button: Press this button to turn the server on and off manually. A
power-control-button shield comes installed around the button to prevent the server
from being turned off accidentally. You can remove this disk-shaped shield if you
prefer.
Reset button: Press this button to reset the server and run the power-on self-test
(POST). You might have to use a pen or the end of a straightened paper clip to
press the button.
Hard disk drive activity LED: When this LED is flashing, it indicates that a hard
disk drive is in use.
Locator LED: This LED can be lit remotely by the system administrator to aid in
visually locating the server.
System-error LED: When this 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 5, “Solving problems,” on page 37 for additional information.
© Lenovo 2008, 2009. Portions © IBM Corp. 2008. 25