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System-diagnostic lights
This section lists the system-diagnostic lights of your XPS 16 9640.
Table 47. System-diagnostic lights
Amber
1
1
1
1
2
2
2
2
2
2
2
2
3
3
3
3
3
3
3
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.
Blinking pattern
White
1
2
5
6
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
Problem description
TPM detection failure
Unrecoverable SPI Flash Failure
EC unable to program i-Fuse
Generic catch-all for ungraceful EC code
flow errors
CPU failure
System board failure (included BIOS
corruption or ROM error)
No memory or RAM detected
Memory or RAM failure
Invalid memory installed
System board or Chipset Error
LCD failure (SBIOS message)
LCD failure (EC detection of power rail
failure)
CMOS battery failure
PCI or Video card or chip failure
BIOS Recovery image not found
BIOS Recovery image found but invalid
Power rail failure
Flash corruption is detected by SBIOS.
Timeout waiting on ME to reply to HECI
message.
Troubleshooting
109
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