Dell™ OptiPlex™ GX520 User's GuideNotes, Notices, and CautionsAbbreviations and AcronymsFor a complete list of abbreviations and acronyms, see the Glossary.If you purchased a Dell™ n Series computer, any references in this document to Microsoft® Windows® operating systems are not applicable.Information in this document is subject to change without notice.© 2005–2006 Dell Inc. All rights reserved.Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.Trademarks used in this text: Dell, the DELL logo, OptiPlex, Inspiron, Dimension, Latitude, Dell Precision, DellNet, TravelLite, Dell OpenManage, PowerVault, Axim, PowerEdge, PowerConnect,and PowerApp are trademarks of Dell Inc.; Intel, Pentium, and Celeron are registered trademarks of Intel Corporation; Microsoft, MS-DOS, and Windows are registered trademarks ofMicrosoft Corporation; IBM is a registered trademark of International Business Machines Corporation; Bluetooth is a trademark owned by Bluetooth SIG, Inc. and is used by DellInc. under license. ENERGY STAR is a registered trademark of the U.S. Environmental Protection Agency. As an ENERGY STAR partner, Dell Inc. has determined that this productmeets the ENERGY STAR guidelines for energy efficiency.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 Inc. disclaims anyproprietary interest in trademarks and trade names other than its own.Model DCNEOctober 2006 P/N W9246 Rev. A03Desktop ComputerFinding InformationBefore You BeginChassis Intrusion SwitchDesktop ComputerAbout Your Desktop ComputerInside Your ComputerDesktop Computer SpecificationsRemoving the Computer CoverI/O PanelDrivesPCI and PCI Express Cards and Serial Port AdaptersPower SupplyProcessorAdvanced FeaturesBatteryReplacing the System BoardMemoryReplacing the Computer CoverCleaning Your ComputerReinstalling Drivers and the Operating SystemSolving ProblemsMicrosoft® Windows® XP FeaturesGlossaryTroubleshooting Tools and UtilitiesGetting HelpWarrantyFCC Notices (U.S. Only)NOTE: 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.