Recovering The Operating System - Dell OptiPlex 5090 Tower Service Manual

Table 20. Diagnostic LED behavior (continued)
Blinking pattern
Amber
2
3
3
3
3
3
3
3
4

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 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.
82 Troubleshooting
White Problem description
6 System board / Chipset
Error / Clock failure / Gate
A20 failure / Super I/O
failure / Keyboard controller
1 CMOS battery failure
2 PCI or Video card/chip failure
3 BIOS Recovery image not
4 BIOS Recovery image found
5
6 SBIOS Flash corruption
7 Intel ME (Management
2 CPU Power Cable Connection
failure
found
but invalid
Power rail failure
Engine) Error
Issue
Suggested resolution
●
If problem persists,
replace the memory
module.
●
Flash latest BIOS version
●
If problem persists,
replace the system board.
● Reset the CMOS battery
connection.
● If problem persists,
replace the RTS battery.
Replace the system board.
● Flash latest BIOS version
● If problem persists,
replace the system board.
●
Flash latest BIOS version
● If problem persists,
replace the system board.
● EC ran into power
sequencing failure.
● If problem persists,
replace the system board.
● Flash corruption detected
by SBIOS
● If problem persists,
replace the system board.
● Timeout waiting on ME to
reply to HECI message
● If problem persists,
replace the system board.