LED Name

Function

Location

Color

Description

 

 

 

 

 

DIMM Fault

Identify failing

On the system

Orange

On = Fault

 

memory module

board, at the

 

 

 

 

 

back of each

 

 

 

 

 

DIMM socket

 

 

 

 

 

 

 

 

POST Code

Display boot 80

On the left back

Each LED

See the following Post Code

diagnostic

POST code

of the system

can be

Table

LEDs 1-4

 

board

Off,

 

 

(LSB, bit1,

 

 

Green,

 

 

bit2, MSB)

 

 

Orange,

 

 

 

 

 

or Red

 

 

 

 

 

 

 

CPU 1 and 2

Identify fan

At the front

Orange

On = Fault

Fan Fault

failure

center of the

 

 

 

 

 

system board

 

 

 

 

 

 

 

 

CPU 1 and 2

Identify

On the system

Orange

On = Fault

Fault

processor failure

board, 1” behind

 

 

 

 

 

the processor

 

 

 

 

 

socket

 

 

 

 

 

 

 

 

5v Standby

Identify 5v

At the front left of

Orange

On = 5v standby power on

 

standby power

the system board

 

 

 

 

on state

 

 

 

 

 

 

 

 

 

 

Power LED

Identify the

Front panel

Green

■

Off = Power is off (or S5)

 

power state of

 

 

■

On = Power is on (or S0)

 

the system

 

 

■ Slow blink = Low power

 

 

 

 

 

state (S1-S3)

 

 

 

 

 

 

Diagnostic LEDs

The BIOS sends a 1-byte hex code to port 80 prior to each POST task. These codes are displayed on four tri-colored LEDs, located on the system board and available at the back of the server chassis. They can provide troubleshooting information in the event of a system hang during POST.

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