Dell Precision 340 Setup and Quick Reference Guide - Page 46

during normal operation. To locate the diagnostic lights, see Back Panel - yellow light

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www.dell.com | support.dell.com Diagnostic Lights When you turn on your computer, it performs a series of self-diagnostic tests. A successful power-on self-test (POST) ends with a single beep that signifies the start of normal operation. If the computer fails to complete the POST, a series of lights located on the computer can help you understand which test failed or why the computer stopped responding. These lights communicate problems encountered before and during POST only, not during normal operation. To locate the diagnostic lights, see "Back Panel" on page 46. The following table lists the code for the diagnostic lights, gives probable causes, and suggests corrective actions.The lights are labeled to help you match the pattern on your computer with ones shown in the table. Back Panel diagnostic lights Diagnostic Light Codes During POST Light Pattern A B C D Cause off No electrical power is supplied to the computer. off off off = yellow = green = off 46 Setup and Quick Re ference Guide

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46
Setup and Quick Reference Guide
www.dell.com | support.dell.com
Diagnostic Lights
When you turn on your computer, it performs a series of self-diagnostic
tests. A successful power-on self-test (POST) ends with a single beep that
signifies the start of normal operation. If the computer fails to complete the
POST, a series of lights located on the computer can help you understand
which test failed or why the computer stopped responding. These lights
communicate problems encountered before and during POST only, not
during normal operation. To locate the diagnostic lights, see "Back Panel" on
page 46.
The following table lists the code for the diagnostic lights, gives probable
causes, and suggests corrective actions.The lights are labeled to help you
match the pattern on your computer with ones shown in the table.
Back Panel
Diagnostic Light Codes During POST
Light Pattern
Cause
off
off
off
off
No electrical power is supplied to the computer.
diagnostic lights
A
B
C
D
= yellow
= green
= off