Dell E521 Owner's Manual - Page 50

Light Pattern Problem Description A possible graphics card failure has occurred. A possible floppy or hard drive failure has occurred. Suggested Resolution • If the computer has a graphics card, remove the card, reinstall it (see "PCI Express Cards" on page 76), and then restart the computer. • If the problem still exists, install a graphics card that you know works and restart the computer. • If the problem persists or the computer has integrated graphics, contact Dell (see "Contacting Dell" on page 122). Reseat all power and data cables and restart the computer. A possible USB failure has occurred. Reinstall all USB devices, check cable connections, and then restart the computer. No memory modules are detected. Memory modules are detected, but a memory configuration or compatibility error exists. • If you have two or more memory modules installed, remove the modules, reinstall one module (see "Installing Memory" on page 68), 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 "Installing Memory" on page 68). • If the problem persists, contact Dell (see "Contacting Dell" on page 122). • Ensure that no special memory module/memory connector placement requirements exist (see "Memory Installation Guidelines" on page 66). • Verify that the memory modules that you are installing are compatible with your computer (see "Memory Installation Guidelines" on page 66). • If the problem persists, contact Dell (see "Contacting Dell" on page 122). 50 Troubleshooting Tools