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Chapter 3. Server controls, LEDs, and power
This section 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, LEDs, and connectors on the front of
the server.
1 Power-on LED 6 CD-eject or DVD-eject button
2 Power-control button 7 CD or DVD drive activity LED
3 Hard disk drive activity LED 8 Optional diskette-eject button
4 System-error LED 9 Optional diskette drive activity LED
5 USB connectors
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. A power LED is also on the rear of the server.
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. You can install it
to prevent the server from being turned off accidentally.
© Lenovo 2008, 2009. Portions © IBM Corp. 2008. 35