IBM Netfinity 4500R User Reference Manual page 18

Controls and indicators
6
IBM® Netfinity® 4500R User's Reference
Power control button: Press this button to manually turn the server on or off.
Note: A power-control-button shield is provided with your server. You can install
this circular disk over the power control button to prevent accidental manual
power-off.
Statement 5
CAUTION:
The power control button on the device and the power supply do not turn off
the electrical current supplied to the device. The device also might have more
than one power cord. To remove all electrical current from the device, ensure
that all power cords are disconnected from the power source.
Reset button: Press this button to reset the server and run the power-on self-test
(POST).
AC power light: This green light on the power supply (under the bezel) provides
status information about the power supply. During normal operation, both the AC
and DC power lights are on. For any other combination of lights, see "Power supply
LEDs" on page 134.
Operator information panel: The lights on this panel give status information for
your server. See "Operator information panel" on page 7 for more information.
DC power light: This green light on the power supply (under the bezel) provides
status information about the power supply. During normal operation, both the AC
and DC power lights are on. For any other combination of lights, see "Power supply
LEDs" on page 134.
Hard disk drive status light: Each of the hot-swap drive bays has a hard disk drive
status light. When this amber light is on continuously, the drive has failed.
If a ServeRAID adapter is installed and this light flashes slowly (one flash per second),
the drive is being rebuilt. When the light flashes rapidly (three flashes per second), the
controller is identifying the drive.
Hard disk activity drive light: Each of the hot-swap drive bays has a hard disk drive
activity light. When this green light is flashing, the controller is accessing the drive.