Dell DJ42F61 Owner's Manual - Page 33

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 48). 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 Memory modules are detected, but a memory failure has occurred. = yellow = green = off • If you have one memory module installed, reinstall it (see page 53) and restart the computer. • If you have two or more memory modules installed, remove the modules, reinstall one module (see page 53), and then restart the computer. If the computer starts normally, reinstall an additional module. Continue until you have identified a faulty module or reinstalled all modules without error. • If available, install properly working memory of the same type into your computer (see page 53). • If the problem persists, contact Dell (see page 89). Advanced Troubleshooting 33