System Board Leds - IBM BladeCenter HS21 Series Problem Determination And Service Manual

The following illustration shows the location of the light path diagnostics switch on
the optional IBM BladeCenter Memory and I/O Expansion Blade.

System board LEDs

The following illustration shows the LEDs on the system board. You must remove
the blade server from the BladeCenter unit, open the cover or remove any optional
expansion units, and press the light path diagnostics switch to light any error LEDs
that were turned on during processing. Diagnosing problems using the light path
LEDs is described in"Light path diagnostics" on page 51.
Light path diagnostics
DIMM 4 error LED
DIMM 3 error LED
DIMM 2 error LED
DIMM 1 error LED
Microprocessor 1 error LED
Microprocessor 2 error LED
Light path diagnostics panel
Power jumper error LED
Battery error LED
SAS 0 hard disk drive error LED
SAS 1 hard disk drive error LED
9
Chapter 1. Introduction