Removing and Installing Parts 1536 Slide out the power supply and lift it out.7 Slide the replacement power supply towards the back of the computer.8 Replace and tighten all screws that secure the power supply to the back ofthe computer chassis.CAUTION: Failure to replace and tighten all screws may cause electrical shockas these screws are a key part of the system grounding.NOTICE: Route the DC power cables under the chassis tabs. The cables must beproperly routed to prevent the cables from being damaged.9 Reconnect the DC power cables to the system board and drives.10 Secure the hard drive cable, optical drive data cable, and the front panelribbon cable to the securing clip on the side of the power supply.NOTE: Double-check all cable connections to make sure they are secure.11 Replace the computer cover (see "Replacing the Computer Cover" onpage 166).12 Connect your computer and devices to an electrical outlet, and turnthem on.13 Verify that the computer works correctly by running the Dell Diagnostics(see "Dell Diagnostics" on page 86).I/O PanelCAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in the Product Information Guide.CAUTION: To guard against electrical shock, always unplug your computer fromthe electrical outlet before opening the cover.CAUTION: The heat sink assembly, power supply, and other components may bevery hot during normal operation. Be sure that they have had sufficient time to coolbefore you touch them.NOTICE: To prevent static damage to components inside your computer, dischargestatic electricity from your body before you touch any of your computer’s electroniccomponents. You can do so by touching an unpainted metal surface on thecomputer chassis.
