Dell XPS Gen 2 Owner's Manual - Page 49
Advanced Troubleshooting, Diagnostic Lights - bios
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Advanced Troubleshooting Diagnostic Lights To help you troubleshoot a problem, your computer has four lights labeled "A," "B," "C," and "D" (see page 65) on the back panel. The lights can be yellow or green. When the computer starts normally, the lights flash. After the computer starts, all four lights display solid green. If the computer malfunctions, the color and sequence of the lights identify the problem. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions on page 9. Light Pattern ABCD Problem Description Suggested Resolution The computer is in a normal off condition Verify that the computer is plugged into a or a possible pre-BIOS failure has working electrical outlet and that you occurred. have pressed the power button. ABCD A possible processor failure has occurred. Reinstall the processor (see page 93) and restart the computer. ABCD Memory modules are detected, but a memory failure has occurred. = yellow = green = off 1 Reinstall all memory modules (see page 73). 2 Ensure that all the connector tabs are locked. 3 Restart the computer. 4 If the problem persists, contact Dell (see page 112). Advanced Troubleshooting 49