Table 47. Diagnostic-light LED codes(continued)
Blinking pattern
Problem description Suggested resolutionAmber White
If problem persists, replace
the system board.
3 4 BIOS Recovery image found
but invalid
Flash latest BIOS version.
If problem persists, replace
the system board.
3 5 Power rail failure EC ran into power sequencing
failure.
If problem persists, replace
the system board.
3 6 SBIOS Flash corruption Flash corruption detected by
SBIOS.
If problem persists, replace
the system board.
3 7 Intel Management Engine
(ME) Error
Timeout waiting on ME to
reply to HECI message.
If problem persists, replace
the system board.
4 2 CPU Power Cable Connection
Issue
Reset the processor power
cable.
NOTE: Blinking 3-3-3 LEDs on Lock LED (Caps Lock or Num Lock), Power button LED (without Fingerprint reader), and
Diagnostic LED indicates failure to provide input during LCD panel test on Dell SupportAssist Pre-boot System Performance
Check diagnostics.
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 Clock—RTC reset
The Real Time Clock (RTC) reset function allows you or the service technician to recover the recently launched model Dell
Latitude and Precision 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 139
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