Recovering The Operating System - Dell Latitude 9450 2-in-1 Owner's Manual

Table 45. System-diagnostic lights (continued)
Blinking pattern
Amber
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
120 Troubleshooting
White Problem description
6 System board or Chipset
7 LCD failure (SBIOS message)
8 LCD failure (EC detection of
1 CMOS battery failure
2 PCI or Video card or chip
3 BIOS Recovery image not
4 BIOS Recovery image found
5
6 Flash corruption is detected
7 Timeout waiting on ME to
reply to HECI message.
Error
power rail failure)
failure
found
but invalid
Power rail failure
by SBIOS.
Suggested resolution
Replace the system board.
Replace the LCD module.
Replace the system board.
● Reset the main battery
connection.
● If the problem persists,
replace the main battery.
Replace the system board.
● Flash latest BIOS version
● If the problem persists,
replace the system board.
●
Flash latest BIOS version
● If the problem persists,
replace the system board.
Replace the system board.
● Press the power button
for over 25 seconds to
do RTC reset. If the
problem persists, replace
the system board.
● Disconnect all power
source (AC, battery, coin
cell) and drain flea power
by pressing and holding
down the 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 the problem persists,
replace the system board.
Replace the system board.