Dell™ OptiPlex™ GX400 Service ManualBefore You BeginComputer CoverInside Your ComputerSystem Board ComponentsFront PanelFront-Panel InsertsFront-Panel ButtonsPower SupplySystem MemoryDisk Drives and MediaAGP Card BraceExpansion CardsExpansion-Card GuideControl PanelChassis Intrusion SwitchMicroprocessor Airflow ShroudMicroprocessorMicroprocessor Cooling FanVRMComputer BatterySystem BoardNotes, 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 and the DELL logo are trademarks of Dell Computer Corporation.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 Corporation disclaims any proprietary interest in trademarks and trade names other than itsown.A00 28 Feb 2001NOTE: 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 potentially hazardous situation which, if not avoided, may result in minor or moderate injury.