Recovering The Operating System; Real-Time Clock (Rtc Reset); Backup Media And Recovery Options - Dell Latitude 3520 Service Manual

Table 23. System-diagnostic lights (continued)
Blinking pattern
Amber
3
3
NOTE: Blinking 3-3-3 LEDs on Lock LED (Caps-Lock or Nums-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 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.

Real-Time Clock (RTC Reset)

The Real Time Clock (RTC) reset function allows you or the service technician to recover Dell Latitude systems from No
POST/No Power/No Boot situations. The legacy jumper enabled RTC reset has been retired on these models.
Start the RTC reset with the system powered off and connected to AC power. Press and hold the power button for thirty (30)
seconds. The system RTC Reset occurs after you release the power button.

Backup media and recovery options

It is recommended to create a recovery drive to troubleshoot and fix problems that may occur with Windows. Dell proposes
multiple options for recovering Windows operating system on your Dell PC. For more information. see
Media and Recovery Options.
122 Troubleshooting
White Problem description
6 Flash corruption detected by
7 Timeout waiting on ME to
reply to HECI message.
Suggested resolution
●
SBIOS.
●
source (AC, battery, coin
cell) and drain flea power
● Run "BIOS recovery from
USB", and the instructions
●
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
by pressing and holding
down power button 3~5
seconds to ensure all
power are drained.
are in the website Dell
support.
If problem persists,
Dell Windows Backup