IBM eserver xSeries 350 User Reference Manual page 49

The following illustration shows the location of the LEDs on the diagnostic panel.
The diagnostic panel LEDs are visible through a special cutout area located to the left
of the cover-release latch on the top cover. However, to determine the exact location
of the error condition in your server, you might need to remove the top cover to view
the location of the error LED on the diagnostic panel.
Note: The diagnostic panel is also called the LED card.
System board connector
CPU DASD
Memory
NMI
PCI
Bus
SP Bus
A B C
Event Log
Power
Supply Non Red
1 2 3 Over Spec
Temp
Fan
The meanings of these LEDs are as follows:
NMI
SP Bus
PCI Bus A (PCIA)
PCI Bus B (PCIB)
PCI Bus C (PCIC)
DASD
Memory
CPU
FAN
TEMP
NON RED
OVER SPEC
Power supply 1
Power supply 2
Power supply 3
Diskette drive connector
Nonmaskable interrupt
Service processor failure
PCI bus A fault
PCI bus B fault
PCI bus C fault
Hard disk drive fault
Memory fault
Microprocessor fault
Fan failure
System temperature failure
Nonredundant power mode
Over specification
Power supply number 1 failure
Power supply number 2 failure
Power supply number 3 failure
Chapter 5. Installing options
37