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NOTICE: You must position the processor correctly in the socket to avoid permanent damage to the processor and the computer. Ensure that the notches on the processor are aligned with the notches on the socket. 1 processor cover 2 securing tab 3 processor 4 processor socket 5 center cover latch 6 release lever 7 alignment notches (2) 8 socket and processor pin-1 indicator 5. Gently place the processor in the socket and check to ensure that the processor is positioned correctly. 6. When the processor is fully seated in the socket, close the processor cover. Ensure that the securing 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 beneath the securing tab. 8. Replace the heat sink assembly (see Installing the Heat Sink Assembly). 9. Replace the hard drive (see Installing a Hard Drive). 10. Replace the computer cover (see Replacing the Computer Cover). 11. Connect your computer and devices to electrical outlets, and then turn them on. Modem Replacing the Modem 1. Follow the procedures in Before You Begin. 2. Remove the hard drive (see Removing a Hard Drive). 3. Remove the existing modem: a. Remove the modem cable from the RJ11 internal connector. b. Use a small Phillips screwdriver to remove the two screws securing the modem to the system board, and then set the screws aside. c. Pull straight up on the attached pull-tab to lift the modem out of its connector on the system board. d. Remove the modem cable from the modem. NOTICE: Socket pins are delicate. To avoid damage, ensure that the processor is aligned properly with the socket, and do not use excessive force when you install the processor. NOTICE: When you install the heat sink assembly, do not touch the thermal interface to prevent damage to the thermal interface material on the interface. NOTICE: If you are not installing a processor upgrade kit from Dell, reuse the original heat sink assembly when you replace 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 received. NOTICE: To connect a network cable, first plug the cable into the network port or device and then plug it into the computer. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. NOTICE: Before you remove or install the modem, make sure to disconnect all telephone and network cables from your computer. NOTICE: To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your computer's electronic components. You can do so by touching an unpainted metal surface on the computer chassis. NOTE: For easier access to the modem, it may be necessary to remove the power cable from the power connector (POWER) on the system board (see System Board Components). 4. Install the new modem: a. Connect the T-shaped connector of the modem cable to the modem. b. Align the modem with the screw holes and press the modem into its connector on the system board (see System Board Components). c. Replace and tighten the two screws to secure the modem to the system board. d. Replace the other end of the modem cable to the RJ11 internal connector. 5. Connect the power cable to the power connector (POWER) on the system board (see System Board Components). 6. Replace the hard drive (see Installing a Hard Drive). 7. Replace the computer cover (see Replacing the Computer Cover). Power Supply Removing the Power Supply 1. Follow the procedures in Before You Begin. 2. Disconnect the AC power cable from the power supply connector. 3. Disconnect all DC power cables from the system board and drives. 4. Remove the three power supply screws. 1 pull tab 2 modem cable 3 screws (2) 4 RJ11 internal connector (RJ11INT) 5 modem 6 T-shaped connector attached to the modem cable NOTICE: The connectors are keyed to ensure correct insertion. If you feel resistance, check the connectors for proper orientation, then try again. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions 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. 5. Slide the power supply approximately 1 inch toward the front of the computer. 6. Carefully lift the power supply out of the computer. Replacing the Power Supply 1. Lower the power supply into the computer and slide the power supply toward the back of the computer. 2. Replace the three p...