Dell Latitude 5550 Owners Manual - Page 171

Recovering the operating system, Real-Time Clock (RTC Reset

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Table 60. System-diagnostic lights (continued) Blinking pattern Amber White 3 3 3 4 3 5 3 6 3 7 Problem description BIOS Recovery image not found BIOS Recovery image found but invalid Power rail failure Suggested resolution ● 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. Flash corruption is detected by SBIOS. Timeout waiting on ME to reply to HECI message. ● 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. 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 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. Real-Time Clock (RTC Reset) The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell computers from No POST/No Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models. Troubleshooting 171

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Table 60. System-diagnostic lights (continued)
Blinking pattern
Problem description
Suggested resolution
Amber
White
3
3
BIOS Recovery image not
found
●
Flash latest BIOS version
●
If the problem persists,
replace the system board.
3
4
BIOS Recovery image found
but invalid
●
Flash latest BIOS version
●
If the problem persists,
replace the system board.
3
5
Power rail failure
Replace the system board.
3
6
Flash corruption is detected
by SBIOS.
●
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.
3
7
Timeout waiting on ME to
reply to HECI message.
Replace the system board.
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
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
.
Real-Time Clock (RTC Reset)
The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell computers from No POST/No
Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models.
Troubleshooting
171