IBM 8671 - Eserver xSeries 235, Maintenance And Troubleshooting Manual

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server. The meaning of the attention LED is defined by your operating system. For
an illustration showing this LED on the system board, see “LEDs for Active PCI
slots” on page 36.
NMI button: The Non-Maskable Interrupt (NMI) button is for service use only.
DC power LED: This green LED provides status information about the power
supply. During typical operation, both the ac and dc power LEDs are on. For any
other combination of LEDs, see “Power-supply LED errors” on page 146.
AC power LED: This green LED provides status information about the power
supply. During typical operation, both the ac and dc power LEDs are on. For any
other combination of LEDs, see “Power-supply LED errors” on page 146.
Operator information panel
The following illustration shows the status LEDs on the operator information panel
on the front of the server.
TX
RX
OK
1
Power-on
LED
POST-
complete LED Hard disk drive
activity LED
Information
LED
System-
error LED Ethernet transmit/
receive activity LED
/
Important: If the power-on LED is off, it does not mean there is no electrical
current present in the server. The LED might be burned out. To remove
all electrical current from the server, you must unplug the server power
cords from the electrical outlets or from the uninterruptible power
device.
Power-on LED: When this green LED is on, power is present in the server.
When this LED flashes, the server is in Standby mode (the system operating
system is turned off and ac current is present). When this LED is off, the power
subsystem, the ac power, or an LED has failed.
POST-complete LED: This green LED is on when POST is completed without
any errors.
Hard disk drive activity LED: This green LED flickers when there is activity on
a hard disk drive.
Information LED: When this amber LED is on, the server power supplies are
nonredundant, or some other noncritical event has occurred. The event is
recorded in the Error log. See “Viewing error logs from the Configuration/Setup
Utility program” on page 32 for instructions for viewing the Error log. Check the
diagnostic LED panel for more detailed information (see “Diagnostic panel
system error LED” on page 132.
System-error LED: This amber LED is on when a system error occurs. An LED
on the diagnostic LED panel will also be on to further isolate the error. (For
more information, see “Diagnostic panel system error LED” on page 132.)
Ethernet transmit/receive activity LED: When this green LED is on, there is
activity between the server and the network.
Chapter 1. General information
7