IBM E Server x 100 Series, Installation Manual

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Power-control button
Press this button to turn the server on and off manually. A
power-control-button shield comes with the server.
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 cord from the
electrical outlet.
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xSeries 100 Type 8486: Installation Guide