Dell Precision™ T5500 Service ManualNotes, Cautions, and WarningsIf 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.© 2009 Dell Inc. All rights reserved.Reproduction of this material in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden.Trademarks used in this text: Dell, the DELL logo, and Dell Precision are trademarks of Dell Inc.; Intel and Xeon are registered trademarks of Intel Corporation; Bluetooth is aregistered trademark owned by Bluetooth SIG, Inc. and is used by Dell under license; Blu-ray Disc is a trademark of the Blu-ray Disc Association; Microsoft, Windows, WindowsServer, MS-DOS, Aero, Windows Vista. and the Windows Vista start button are either trademarks or registered trademarks of Microsoft Corporation in the United States and/or othercountries.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 DCTASeptember 2009 Rev. A01Working on Your ComputerAdding and Replacing PartsSpecificationsDiagnosticsAbout MemoryAbout Your System BoardSystem SetupNOTE: A NOTE indicates important information that helps you make better use of your computer.CAUTION: A CAUTION indicates potential damage to hardware or loss of data if instructions are not followed.WARNING: A WARNING indicates a potential for property damage, personal injury, or death.