Dell Precision 390: Code Cause Error Messages Diagnostic Lights Light Pattern Problem Description Suggested Resolution

Code Cause

3-4-2 Screen retrace failure

3-4-3 Search for video ROM failure

4-2-1 No timer 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

Error Messages

NOTE: If the message is not listed, see the documentation for either the operating system or the program that was

running when the message appeared.

If an error occurs during start-up, a message may be displayed on the monitor identifying the problem.

See "Error Messages" in the

User’s Guide

for suggestions on resolving any problems.

Diagnostic Lights

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located

in the Product Information Guide.

To help you troubleshoot a problem, your computer has four lights labeled "1," "2," "3," and "4" on the front.

The lights can be off or green. When the computer starts normally, the lights flash. After the computer

starts, all four lights display solid green briefly and then turn off to indicate normal operation. If the

computer malfunctions, the pattern of the lights identify the problem.

Light Pattern Problem Description Suggested Resolution

The computer is in a normal off

Plug the computer into a working

condition or a possible pre-BIOS

electrical outlet and press the power

failure has occurred.

button.

NOTE: The diagnostic lights turn off after

a short time if the computer is in a normal

operating condition after POST.

Quick Reference Guide 37