Table 12. Diagnostic light codes(continued)
Diagnostic light codes
(Amber, White)
Problem description
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/Chipset Error
3,1 CMOS battery failure
3,2 PCI of Video card/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
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.
For more information about the Dell SupportAssist OS Recovery, see Dell SupportAssist OS Recovery User's Guide at
www.dell.com/serviceabilitytools. Click SupportAssist and then, click SupportAssist OS Recovery.
Wi-Fi power cycle
About this task
If your computer is unable to access the Internet due to Wi-Fi connectivity issues a Wi-Fi power cycle procedure may be
performed. The following procedure provides the instructions on how to conduct a Wi-Fi power cycle:
NOTE: Some ISPs (Internet Service Providers) provide a modem/router combo device.
Steps
1. Turn off your computer.
2. Turn off the modem.
3. Turn off the wireless router.
110
Troubleshooting
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