48 Advanced Troubleshootingw w w . d e l l . c o m | s u p p o r t . d e l l . c o mA possible floppy drive or hard drive failure hasoccurred.Reseat all power and data cables and restartthe computer.A possible USB failure has occurred. Reinstall all USB devices, check cableconnections, and then restart the computer.No memory modules are detected. • If you have two or more memory modulesinstalled, remove the modules, reinstall onemodule (see page 67), and then restart thecomputer. If the computer starts normally,reinstall an additional module. Continueuntil you have identified a faulty module orreinstalled all modules without error.• If available, install properly working memoryof the same type into your computer (seepage 67).• If the problem persists, contact Dell (seepage 114).Memory modules are detected, but a memoryconfiguration or compatibility error exists.• Ensure that no special memorymodule/memory connector placementrequirements exist (see page 65).• Verify that the memory modules that you areinstalling are compatible with your computer(see page 65).• If the problem persists, contact Dell (seepage 114).A possible expansion card failure has occurred. 1 Determine whether a conflict exists byremoving a card and restarting the computer(see page 69).2 If the problem persists, reinstall the card thatyou removed, remove a different card, andthen restart the computer.3 Repeat this process for each card. If thecomputer starts normally, troubleshoot thelast card removed from the computer forresource conflicts (see page 53).4 If the problem persists, contact Dell (seepage 114).Light Pattern Problem Description Suggested Resolution
