Recovering The Operating System; Real-Time Clock (Rtc Reset); Backup Media And Recovery Options - Dell Latitude 5521 Service Manual

Blinking Pattern
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Camera status light: Indicates whether the camera is in use.
● Solid white — Camera is in use.
● Off — Camera is not in use.
Caps Lock status light: Indicates whether Caps Lock is enabled or disabled.
● Solid white — Caps Lock enabled.
● Off — Caps Lock disabled.

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 10 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/support.

Real-Time Clock (RTC Reset)

The Real Time Clock (RTC) reset function allows you to recover Dell computer from No POST, No Power or, No Boot like
situations. There is no coin-cell battery on this computer, the main battery reserves 2% of its capacity for RTC function.
How to Reset the Real-Time Clock (RTC)
● Start the RTC reset with the computer powered off and connected to AC power.
● Press and hold the power button for thirty (30-35) seconds.
● The computer RTC Reset occurs after you release the power button.
NOTE: For more information, see the knowledge base article

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.
116 Troubleshooting
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Problem description
PCI or Video card/chip failure
BIOS recovery image not
found
BIOS recovery image found
but invalid
Power rail failure
Flash corruption detected by
SBIOS.
Timeout waiting on ME to
reply to HECI message.
000125880 at https://www.dell.com/support/.
Suggested resolution
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.
Replace the system board.
Replace the system board.
Dell Windows Backup