Recovering The Operating System - Dell Inspiron 7405 2n1 Service Manual

Table 8. Power and battery-charge status light
Power and battery-charge status light
Solid white
Amber
Off
Blinking power and battery-charge status light
The power and battery-status light blinks alternately between amber and off to indicate issues that your computer is encountering.
For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by
a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.
The following table shows the different power and battery-status light patterns and the associated issues.
Table 9. LED codes
Diagnostic light codes
2,1
2,2
2,3
2,4
2,5
2,6
2,7
2,8
3,1
3,2
3,3
3,4
3,5
3,6
3,7

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.
60 Troubleshooting
Status of computer
• The power adapter is
connected and the battery is
fully charged.
• The power adapter is
connected and the battery
has more than five percent
charge.
The computer is running on
battery and the battery has less
than five percent charge.
The computer is in sleep state,
hibernation, or turned off.
Problem description
Processor failure
System board: BIOS or ROM (Read-Only Memory) failure
No memory or RAM (Random-Access Memory) detected
Memory or RAM (Random-Access Memory) failure
Invalid memory installed
System-board or chipset error
Display failure
LCD power rail failure.
CMOS battery failure
PCI, video card/chip failure
Recovery image not found
Recovery image found but invalid
Power-rail failure
System BIOS Flash incomplete
Management Engine (ME) error