Light Path Diagnostics - IBM Flex System x240 M5 Product Manual

Light path diagnostics

For quick problem determination when it is physically at the server, the x240 M5 offers the following
three-step guided path:
1.
The Fault LED on the front panel.
2.
The light path diagnostics panel, as shown in the following figure.
3.
LEDs next to key components on the system board.
The x240 M5 light path diagnostics panel is inside the server between the two processors, as shown in
the following figure.
Figure 10. Location of x240 M5 light path diagnostics panel
To illuminate the light path diagnostics LEDs, power off the compute node, slide it out of the chassis, and
press the power button. The power button doubles as the light path diagnostics reminder button when the
server is removed from the chassis.
The meanings of the LEDs in the light path diagnostics panel are listed in the following table.
Table 18. Light path diagnostic panel LEDs
LED Meaning
LP The light path diagnostics panel is operational.
SYS BRD A system board error is detected.
NMI A non-maskable interrupt (NMI) occurred.
SEE EXP A fault is detected in the adjacent expansion unit (if installed).
MIS A mismatch occurred between the processors, DIMMs, or HDDs within the configuration as reported
by POST.
TEMP An over-temperature condition occurred that was critical enough to shut down the server.
MEM A memory fault occurred. The corresponding DIMM error LEDs on the system board are also lit.
IBM Flex System x240 M5 Product Guide 27