Dell™ OptiPlex™ GX400 System User's GuideSafety InstructionsSafety First—For You and Your ComputerProtecting Against Electrostatic DischargeErgonomic Computing HabitsAbout Your ComputerFront View of Your ComputerBack View of Your ComputerInside Your ComputerAdvanced FeaturesSystem SettingsManageabilitySecurityPassword ProtectionJumper SettingsInstalling and Configuring SoftwareTAPIPower ManagementInstalling UpgradesComputer CoverPower SupplyFront PanelSystem MemoryDisk Drives and MediaAGP Card BraceExpansion CardsMicroprocessorVRMSystem BatteryTechnical SpecificationsSolving ProblemsBefore You BeginDell DiagnosticsMessages and CodesSoftware ProblemsGetting HelpHelp OverviewDell Contact NumbersAdditional InformationRegulatory NoticesENERGY STAR® ComplianceLimited Warranty and Return PolicyMicrosoft® Windows® XP FeaturesNotes, Notices, and CautionsInformation in this document is subject to change without notice.© 2001 Dell Computer Corporation. All rights reserved.Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.Trademarks used in this text: Dell, OptiPlex, Dell OpenManage, Dimension, Inspiron, Latitude, DellWare, and the DELL logo are trademarks of Dell Computer Corporation; Microsoft,Windows, MS-DOS, and Windows NT are registered trademarks of Microsoft Corporation; Intel and Pentium are registered trademarks of Intel Corporation; 3Com is a registeredtrademark of 3Com Corporation. As an ENERGY STAR Partner, Dell Computer Corporation has determined that this product meets the ENERGY STAR guidelines for energyefficiency.Other trademarks and trade names may be used in this document to refer to either the entities claiming the marks and names or their products. Dell Computer Corporationdisclaims any proprietary interest in trademarks and trade names other than its own.September 2001 P/N 66CUJ Rev. A01NOTE: A NOTE indicates important information that helps you make better use of your computer.NOTICE: A NOTICE indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.CAUTION: A CAUTION indicates a potential for property damage, personal injury, or death.