Working Inside Your Computer 7-3Pivot the cover down toward the back and into posi-tion (make sure the securing buttons click intoplace).Figure 7-3. Replacing the Computer Cover4. If you are using a padlock to secure your system,reinstall the padlock.Unpacking Your Hardware OptionWhen you remove an option from its shipping carton,you may find it wrapped in antistatic packing materialdesigned to protect it from electrostatic damage. Do notremove the packing material until you are ready to installthe option.Inside Your ComputerFigure 7-4 shows an overhead view of your computer tohelp you orient yourself when installing hardwareoptions. Unless otherwise specified, locations or direc-tions relative to the computer are as shown.Figure 7-4. Computer Orientation ViewFigure 7-5 shows your computer with its cover removed.Refer to this illustration to locate interior features andcomponents discussed in this guide.When you look inside your computer, note the direct cur-rent (DC) power cables coming from the power supply.These cables supply power to the system board; to inter-nal drives; and to certain expansion cards that connect toexternal peripherals.The flat ribbon cable in Figure 7-5 is typical of the inter-face cables for internal drives. An interface cableconnects a drive to a connector on the system board or onan expansion card.The system board—the large printed circuit board at thebottom of the chassis—holds the computer’s control cir-cuitry and other electronic components. Some hardwareoptions are installed directly onto the system board.During an installation procedure, you may be required tochange a jumper setting on the system board, and/or ajumper or switch setting on an expansion card or on adrive. (See “Jumpers and Switches—A General Explana-tion” in Appendix B.)CAUTION: See “Protecting Against ElectrostaticDischarge” in the safety instructions at the front ofthis guide.hooks in slots (4)rightsideleftsidefront of computerdrivecagepowersupplyhard-diskdrivebracketexpansioncard cageback of computer
