Recovering The Operating System - Dell OptiPlex 5400 Service Manual

Table 21. System-diagnostic lights (continued)
Blinking pattern
Amber
2
3
3
3
3
3
3
3

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.
106 Troubleshooting
White Problem description
8 LCD failure (EC detection of
1 CMOS battery failure
2 PCI or Video card/chip failure
3 BIOS Recovery image not
4 BIOS Recovery image found
5
6 Flash corruption detected by
7 Timeout waiting on ME to
reply to HECI message.
power rail failure)
found
but invalid
Power rail failure
SBIOS.
Suggested resolution
Replace the system board.
● Reset the main battery
connection.
● If problem persists,
replace the main 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.
Replace the system board.
● Press power button for
over 25 seconds to do
RTC reset. If problem
persists, replace the
system board.
● Disconnect all power
source (AC, battery, coin
cell) and drain flea power
by pressing and holding
down power button 3~5
seconds to ensure all
power are drained.
● Run "BIOS recovery from
USB", and the instructions
are in the website Dell
support.
● If problem persists,
replace the system board.
Replace the system board.