Table 41. Diagnostic light codes
Diagnostic light codes
(Amber, White)
Problem description
1,5 EC unable to program i-Fuse
1,8 Chipset “Catastrophic Error” signal has tripped
2,1 CPU configuration or CPU failure
2,2 System board: BIOS or Read-Only Memory
(ROM) failure
2,3 No memory or Random-Access Memory (RAM)
detected
2,4 Memory or Random-Access Memory (RAM)
failure
2,5 Invalid memory installed
2,6 System board or chipset error
3,1 CMOS battery failure
NOTE: Not supported on the system without
coin-cell battery.
3,2 PCI of video card or chip failure
3,3 BIOS Recovery 1: BIOS recovery image not found
3,4 BIOS Recovery 2: Recovery image found but
invalid
3,5 Power Rail Failure: 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 stand-alone tool that is preinstalled in Dell computers running the 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, and 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 the primary
operating system due to software or hardware failures.
For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at Serviceability
Tools at the Dell Support Site. Click SupportAssist and then click SupportAssist OS Recovery.
Network power cycle
About this task
If your computer is unable to access the Internet due to network connectivity issues, reset your network devices by performing the
following steps:
164 Troubleshooting
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