Desktop Computer Parts 2555 Reconnect the cables to the system board.6 Replace the computer cover (see "Replacing the Computer Cover" onpage 257).NOTICE: To connect a network cable, first plug the cable into the network deviceand then plug it into the computer.7 Connect your computer and devices to an electrical outlet, and turnthem on.8 Verify that the computer works correctly by running the Dell Diagnostics(see "Dell Diagnostics" on page 111).System BoardRemoving the System BoardCAUTION: To guard against electrical shock, laceration by moving fan blades, orother unexpected injuries, always unplug your computer from the electrical outletbefore opening the cover.CAUTION: The heat sink assembly, power supply, and other components maybecome very hot during normal operation. Be sure that they have had sufficienttime to cool before you touch them.NOTICE: Before touching anything inside your computer, ground yourself bytouching an unpainted metal surface, such as the metal at the back of the computer.While you work, periodically touch an unpainted metal surface to dissipate anystatic electricity that could harm internal components.1 Follow the procedures in "Before You Begin" on page 143.2 Remove the computer cover (see "Removing the Computer Cover" onpage 209).3 Remove any add-in cards on the system board (see "Cards" on page 219).4 Remove the processor and heat sink assembly (see "Speakers" onpage 245).5 Remove the memory modules (see "Removing Memory" on page 219) anddocument which memory module is removed from each memory socket sothat the memory modules can be installed in the same location after theboard is replaced.6 Disconnect all cables from the system board. Note the routing of all cables
