Diagnostic error codes
The Service LED is used for system diagnostics, and it emits amber or white light. A Dell service representative uses the LED
light patterns to troubleshoot your device.
The following table shows different Service LED light patterns and associated problems.
Table 47. Diagnostic error codesī
Diagnostic light codes Problem description
2,1 Processor failure
2,2 System board: BIOS or ROM (Read-Only Memory) failure
2,3 No memory or RAM (Random-Access Memory) detected
2,4 Memory or RAM (Random-Access Memory) failure
2,5 Invalid memory installed
2,6 System-board or chipset error
2,7 Display failure
2,8 Display power failure - EC detection of power-rail failure
3,2 PCI, video card or chip failure
3,3 Recovery image not found
3,4 Recovery image found but invalid
3,5 EC power-rail error
3,6 System BIOS Flash incomplete
3,7 Management Engine (ME) error
NOTE: An error code of 35 indicates an EC power-rail error. This may occur during POST (Power-On Self-Test). Contact
Dell Support for assistance.
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 all Dell computers that are installed with 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, 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.
Real Time ClockāRTC reset
The Real Time Clock (RTC) reset function allows you or the service technician to recover the recently launched model Dell XPS
systems from No POST/No Boot/No Power situations. You can initiate the RTC reset on the system from a power-off state
only if it is connected to AC power. Press and hold the power button for 25 seconds. The system RTC reset occurs after you
release the power button.
NOTE:
If AC power is disconnected from the system during the process or the power button is held longer than 40
seconds, the RTC reset process gets aborted.
Troubleshooting 99
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