Specifications

Chapter 4

Troubleshooting

Identifying and Diagnosing Hardware Problems

Should a hardware failure occur, the system LEDs and the System Event Log (SEL) will help you identify the

problem:

• LEDs. The lights on the front bezel of the server change color and blink in different patterns to help

identify specific hardware problems. LEDs on the rear panel of the server display LAN status.

• The System Event Log (SEL) provides detailed information about the errors identified by the LEDs. The

SEL can be viewed using the MP.

Troubleshooting Using LEDs

If you suspect a hardware failure, the power and system LEDs, located on the control panel of the system, will

help you identify the problem. The following sections describe their functions. Additional diagnostic LEDs are

provided on the system board. (See “System Board Diagnostic LEDs” on page 52.)

If your server has no Extended Core I/O (ECI) card installed, the four diagnostic LEDs on the front panel

warn of impending failures and allow you to take preventive action. For example, you may want to back up

your data or replace a component before it fails.

• If no ECI card is installed, the boot progress is monitored by diagnostic LEDs 1 through 4. During boot-up

the LEDs will turn on in sequence until the BCH prompt is reached.

• If an ECI card is installed, the boot process will be monitored by the management processor (MP). The

four diagnostic LEDs will be disabled (always off). You can monitor server operation from a console using

the MP.

Figure 4-1 Control Panel LEDs

Power and System LEDs

The power and system LED indicate the state of the system. When the system LED is blinking yellow or red,

a problem exists.

Table 4-3 System LED States

System LED State

Off AC power off if power LED is off.

Solid green Running OS.

1 2 3 4 LAN System

System LED

Power On/Off LED

Power Button

Diagnostics LEDs

(Disabled)

Locator Button and LED

LAN

LED