Checkpoint Codes; Light Path Diagnostics - Lenovo ThinkServer RD220 Hardware Maintenance Manual

e. Check all cables and power cords.
f. Set all display controls to the middle positions.
g. Turn on all external devices.
h. Turn on the server.
i. Check the system-error LED on the operator information panel. If it is flashing, check the light path
diagnostics LEDs.
j. Check for the following results:
• Successful completion of POST (see POST for more information).
• Successful completion of startup, which is indicated by a readable display of the operating-system
desktop.

Checkpoint codes

A checkpoint code is a value produced by the UEFI indicating the point at which the system stopped during
startup and Power-On Self Test (POST); it does not provide error codes or suggest replacement components.
These codes may be used for more in-depth troubleshooting by Lenovo support.
Checkpoint codes are shown on the checkpoint code display on the light path diagnostics panel (see Light
path diagnostics LEDs for the location of the display area). By using the checkpoint display, you do not
have to wait for the video to initialize each time you restart the server.
The following table describes the microprocessor checkpoint codes.
Table 2. Microprocessor Checkpoint Codes
Diagnostic Code
0010001
0010002
0010004
0011000
0011002
0011004
001100A
There are two types of checkpoint codes: field programmable gate array (FPGA) hardware checkpoint codes
and UEFI checkpoint codes. The UEFI checkpoint codes might change because of code sequence and
timing changes or when the UEFI code is updated. See http://www.lenovo.com/supportfor checkpoint
code information.

Light path diagnostics

Light path diagnostics is a system of LEDs on various external and internal components of the server.
When an error occurs, LEDs are lit throughout the server. By viewing the LEDs in a particular order, you
can often identify the source of the error.
When LEDs are lit to indicate an error, they remain lit when the server is turned off, provided that the server is
still connected to power and the power supply is operating correctly.
36
ThinkServer RD220 Hardware Maintenance Manual
Description
Microprocessor disabled
Microprocessor not supported
Microprocessor invalid
Invalid microprocessor type
Microprocessor mismatch
Microprocessor failed BIST
Microcode update failed