System Board Built-In Self-Test (M-Bist); Recovering The Operating System - Dell XPS 17 9700 Service Manual

Table 20. LED codes(continued)
Diagnostic light codes
2,5
2,6
2,7
2,8
3,1
3,2
3,4
3,5
3,6
3,7
4,1
4,2
Camera status light: Indicates whether the camera is in use.
• Solid white—Camera is in use.
• Off—Camera is not in use.
Caps Lock status light: Indicates whether Caps Lock is enabled or disabled.
• Solid white—Caps Lock enabled.
• Off—Caps Lock disabled.

System board built-in self-test (M-BIST)

About this task
M-BIST is a built-in self-test diagnostics tool that improves the accuracy of diagnostics of embedded controller (EC) failures in the system
board. M-BIST must be manually initiated before POST and can also run on a dead system .
To invoke the system board built-in self-test (M-BIST), perform the following steps:
1. Press and hold both the M key and the power button to initiate M-BIST.
2. The battery-status light illuminates in amber when there is a system board failure.
3. Replace the system board to fix the issue.
NOTE: The battery status LED does not illuminate when the system board is functioning properly.

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 10 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
support.
Problem description
Invalid memory installed
System board or chipset error
Display failure - SBIOS message
Display failure - EC detection of power rail failure
Coin-cell battery failure
PCI, video card/chip failure
Recovery image found but invalid
Power-rail failure
System BIOS Flash incomplete
Management Engine (ME) error
Memory DIMM: power-rail failure
Processor power cable: connection failure
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Troubleshooting 71