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