Real Time Clock Reset - Dell Vostro 14–3478 Owner's Manual

The system will not shutdown when displaying the Diagnostic Error Codes. Diagnostic Error Codes will always supersede any other use of
the LED. For instance, on Notebooks, battery codes for Low Battery or Battery Failure situations will not be displayed when Diagnostic
Error Codes are being displayed:
Table 33. LED pattern
Blinking pattern Problem Description
Amber White
2 1 processor
2 2 system board, BIOS ROM
2 3 memory
2 4 memory
2 5 memory
2 6 system board; chipset
2 7 display
3 1 RTC power failure
3 2 PCI/Video
3 3 BIOS recovery 1
3 4 BIOS recovery 2

Real Time Clock reset

The Real Time Clock (RTC) reset function allows you or the service technician to recover the recently launched model Dell Latitude and
Precision systems from select No POST/No Boot/No Power situations. You can initiate the RTC reset on the system from a power off
state only if it is connected to AC power. Press and hold the power button for 25 seconds. The system RTC reset occurs after you release
the power button.
NOTE: If AC power is disconnected from the system during the process or the power button is held longer than 40 seconds, the
RTC reset process is aborted.
The RTC reset will reset the BIOS to Defaults, un-provision Intel vPro and reset the system date and time. The following items are
unaffected by the RTC reset:
• Service Tag
• Asset Tag
• Ownership Tag
• Admin Password
• System Password
• HDD Password
• Key Databases
• System Logs
The following items may or may not reset based on your custom BIOS setting selections:
• The Boot List
• Enable Legacy OROMs
• Secure Boot Enable
80 Troubleshooting
Suggested Resolution
processor failure
system board, covers BIOS corruption or ROM error
no memory/no RAM detected
memory failure/RAM failure
invalid memory installed
system board/ chipset error
display failure
coin-cell battery failure
PCI/Video card/chip failure
recovery image nor found
recovery image found but invalid