ix ! This guide is intended for anyone who uses a Dell Dimension XPS Txxx or Txxxr sys-tem. It can be used by both first-time and experienced computer users who want tolearn about the features and operation of the systems or who want to upgrade theircomputers. The chapters and appendixes are summarized as follows: Chapter 1, “Introduction,” provides an overview of the system features and infor-mation on preventive maintenance to protect the computer. Chapter 2, “Installing Upgrades on the System Board,” provides information onperforming various upgrades, such as installing additional memory. The chapterincludes a basic orientation to internal features of the computer. Chapter 3, “Installing Drives,” provides instructions on how to install and removedrives. Chapter 4, “Basic Troubleshooting,” contains checklists to use before calling Dellfor technical assistance and instructions for using the Dell Diagnostics. Chapter 5, “Software Solutions,” has information on reinstalling drivers and theoperating system. Chapter 6, “Checking Inside Your Computer,” presents troubleshooting proce-dures for system components such as expansion cards, memory, and drives. Chapter 7, “Getting Help,” provides information on obtaining technical assis-tance. Users who have been unable to resolve problems using thetroubleshooting information provided in this guide can refer to this chapter. Appendix A, “System Specifications,” is supplemental reference material. Appendix B, “System Setup Program,” describes the system setup programused for checking and changing system configuration data. Appendix C, “Diagnostic Codes, Beep Codes, and System Messages,” docu-ments status and error messages generated during system start-up. Included arepossible causes and corrective actions. Appendix D, “Regulatory Notices,” provides regulatory information on the system. Appendix E, “Warranty and Return Policy,” describes the warranty for your Dellsystem and the “Total Satisfaction” Return Policy.