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NVR and hDVR Systems Setup Guide
APPENDIX B: SERVER HARDWARE TROUBLESHOOTING
Code
Cause
3-4-1
Screen initialization failure
3-4-2
Screen retrace failure
3-4-3
Search for video ROM failure
4–2–1
No time tick
4–2–2
Shutdown failure
4–2–3
Gate A20 failure
4–2–4
Unexpected interrupt in protected mode
4–3–1
Memory failure above address 0FFFFh
4–3–3
Timer-chip counter 2 failure
4–3–4
Time-of-day clock stopped
4–4–1
Serial or parallel port test failure
4–4–2
Failure to decompress code to shadowed memory
4–4–3
Math coprocessor test failure
4–4–4
Cache test failure
DIAGNOSTIC LEDS
The diagnostic LEDs only serve as an indicator of the progress through the POST process. These LEDs do not indicate the problem
that caused the POST routine to stop.
The diagnostic LEDs are located on the front of the chassis next to the power button. These diagnostic LEDs are only active and
visible during the POST process. The diagnostic lights will blink when the power button is amber or off, and will not blink when it is
blue. This has no other significance. Once the operating system starts to load, they turn off and are no longer visible.
The system includes pre-POST and POST LEDs in an attempt to help pinpointing a possible problem with the system easier and
more accurate.
Diagnostic LEDs
Power Button LED
Problem Description
Troubleshooting Steps
The computer is
either turned off or is not
receiving power.
Re-seat the power cable in the power connector at the back of the
computer and the electrical outlet.
Bypass power strips, power extension cables, and other power
protection devices to verify that the computer turns on properly.
Ensure that any power strips being used are plugged into an electri-
cal outlet and are turned on.
Ensure that the electrical outlet is working by testing it with
another device, such as a lamp.
Ensure that the main power cable and front panel cable are securely
connected to the system board.
