Troubleshooting
System diagnostic lights
Power-supply diagnostics light
Indicates the power-supply state.
Hard-drive activity light
Turns on when the computer reads from or writes to the hard drive.
Table 20. LED codes
Diagnostic light codes Problem description
1,1 TPM detection failure
1,2 Unrecoverable SPI flash failure
2,1 CPU failure
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
Recovering the operating system
When your computer is unable to boot to the operating system even after repeated attempts, it automatically starts Dell
SupportAssist OS Recovery.
Dell SupportAssist OS Recovery is a standalone tool that is preinstalled in all Dell computers installed with Windows operating
system. It consists of tools to diagnose and troubleshoot issues that may occur before your computer boots to the operating
system. It enables you to diagnose hardware issues, repair your computer, back up your files, or restore your computer to its
factory state.
You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their
primary operating system due to software or hardware failures.
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