Table 20. LED codes (continued)
Diagnostic light codes Problem description
2,2 Motherboard, covers BIOS corruption or ROM error
2,3 No Memory/RAM detected
2,4 Memory/RAM failure
2,5 Invalid memory installed
2,6 Motherboard/chipset error
3,1 CMOS battery failure
3,2 PCI of Video card/chip failure
3,3 Recovery Image not found
3,4 Recovery Image found but invalid
3,5 EC ran into power sequencing failure
3,6 Flash corruption detected by SBIOS
3,7 Timeout waiting on ME to reply to HECI message
4,1 Memory DIMM power rail failure
4,2 CPU power cable connection issue
Table 21. LED codes
Diagnostic light codes Problem description Recommended solutions
1,1 TPM detection failure Replace the system board or the TPM chip.
1,2 Unrecoverable SPI flash failure Replace the system board.
2,1 CPU failure Run the Intel CPU diagnostics tools. If problem
persists, replace the system board.
2,2 Motherboard, covers BIOS corruption or
ROM error
Flash latest BIOS version. If problem persists, replace
the system board.
2,3 No Memory/RAM detected Confirm that the memory module is installed properly.
If problem persists, replace the memory module.
2,4 Memory/RAM failure Reset the memory module. If problem persists, replace
the memory module.
2,5 Invalid memory installed Reset the memory module. If problem persists, replace
the memory module.
2,6 Motherboard/chipset error Flash latest BIOS version. If problem persists, replace
the system board.
3,1 CMOS battery failure Reset the CMOS battery connection. If problem
persists, replace the CMOS battery.
3,2 PCI of Video card/chip failure Replace the system board.
3,3 Recovery Image not found Flash latest BIOS version. If problem persists, replace
the system board.
3,4 Recovery Image found but invalid Flash latest BIOS version. If problem persists, replace
the system board.
3,5 EC ran into power sequencing failure Run the PSU built-in self-test (BIST) to identify the
issue, reseat the cables. If nothing works, replace the
system board, power supply, or cabling.
3,6 Flash corruption detected by SBIOS Flash corruption detected by system BIOS. If problem
persists, replace the system board.
Troubleshooting 71
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