HP c8000 Technical Reference Manual page 74

Troubleshooting
System and Diagnostic LEDs
The System Status LED on the front panel of the system and the four Diagnostic LEDs on the
rear panel of the system are used for diagnosing the health of the system (see figures on page 1-7
and page 1-9). These LEDs warn of impending hardware failures and allow you to take
preventive action, such as making a system backup or replacing a component before it fails. The
Diagnostic LEDs are labeled 1, 2, 3 and 4 on the rear panel.
The location of red LEDs can be used to identify the category of the fault or warning. For
example, if LED one is red, there is a problem with memory. However, if LEDs one and two are
both red, there is a problem with the system processor.
The following symbols are used in the LED tables.
The System Status LED on the front panel of the system indicates the state of the
system:
The Diagnostic LEDs on the rear panel of the system provide details about each
specific warning or fault:
4–4
Off indicates the system is off.
Green indicates that the system is running normally. Blinking green
indicates that the system is booting (slow blink 0.5Hz).
Blinking orange indicates a WARNING (medium blink 1.0Hz).
Blinking red indicates a FAULT (fast blink 1.5Hz).
Solid red indicates the failing part or sub-system.
Off or solid green diagnostic LEDs provide additional details about the
failure (see page 4-6 and page 4-8).
Technical Reference Guide