Dell XPS Gen 4 Owner's Manual - Page 53
Advanced Troubleshooting, Diagnostic Lights - bios
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Advanced Troubleshooting 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 "A," "B," "C," and "D" on the back panel (see page 71). 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. Light Pattern ABCD Problem Description Suggested Resolution The computer is in a normal off Plug the computer into a working condition or a possible pre-BIOS failure electrical outlet and press the power has occurred. button. ABCD A possible processor failure has occurred. Reinstall the processor (see page 103) and restart the computer. = yellow = green = off Advanced Troubleshooting 53