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Ensure that the tab on the processor cover is positioned underneath the center cover latch on the socket. 7. Pivot the socket release lever back toward the socket and snap it into place to secure the processor. If you installed a processor replacement kit from Dell, return the original heat sink assembly and processor to Dell in the same package in which your replacement kit was sent. 8. Install the heat sink and fan shroud assembly: a. Place the heat sink and fan shroud assembly back onto the heat sink assembly bracket. b. Rotate the heat sink and fan shroud assembly down towards the computer base and tighten the two capture screws. NOTICE: You must position the processor correctly in the socket to avoid permanent damage to the processor and the computer when you turn on the computer. 1 processor cover 6 release lever 2 tab 7 front alignment notch 3 processor 8 socket and processor pin-1 indicator 4 processor socket 9 rear alignment notch 5 center cover latch NOTICE: To avoid damage, ensure that the processor aligns properly with the socket, and do not use excessive force when you install the processor. NOTICE: If you are not installing a processor upgrade kit from Dell, reuse the original heat sink assembly when you replace the processor. NOTICE: Ensure that the heat sink is correctly seated and secure. 9. Replace the computer cover. 10. Connect your computer and devices to electrical outlets, and turn them on. System Board Removing the System Board 1. Follow the procedures in "Before You Begin." 2. Remove any components that restrict access to the system board (optical drives, floppy drive, hard drive). 3. Remove the processor. 4. Disconnect all cables from the system board. 5. Remove the 10 screws that attach the system board to your computer. 1 heat sink and fan shroud assembly 2 heat sink assembly bracket 3 captive screw housings (2) NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug the cable into the computer. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover. NOTICE: Before touching anything inside your computer, ground yourself by touching 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 any static electricity that could harm internal components. 6. Slide the system board assembly toward the front of the computer, and then lift the board up and away. 7. Place the system board assembly that you just removed next to the replacement system board to ensure it is identical. Replacing the System Board 1. Gently align the board and slide it toward the back of the computer. 2. Replace the screws attaching the system board. 3. Replace any components and cables that you removed from the system board. 4. Reconnect all cables to their connectors at the back of the computer. 5. Replace the computer cover. 6. Connect your computer and devices to electrical outlets, and turn them on. Power Supply Removing the Power Supply 1. Follow the procedures in "Before You Begin." 2. Disconnect the DC power cables from the system board and the drives. Note the routing of the DC power cables underneath the tabs in the computer frame as you remove them from the system board and drives. You must route these cables properly when you replace them to prevent them from being pinched or crimped. 3. Remove the four screws that attach the power supply to the back of the computer frame. 4. Press the release button located on the floor of the computer frame. 1 system board 2 screws (10) NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug the cable into the computer. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. 5. Slide the power supply approximately 1 inch towards the front of the computer. 6. Lift the power supply up and out of the computer. Replacing the Power Supply 1. Slide the power supply into place. 2. Replace the screws that secure the power supply to the back of the computer frame. 3. Reconnect the DC power cables. 4. Connect the AC power cable to the connector. 5. Run the cables underneath the clips, and press the clips to close them over the cables. 6. Replace the computer cover. 7. Connect your computer and devices to electrical outlets, and turn them on. Battery Replacing the Battery 1 release button 2 power supply 3 screws (4) 4 AC power connector CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug the cable into the computer. CAUTION: Before you begin...