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4. Lift up the airflow shroud. 5. Remove the microprocessor heat sink: a. Twist the heat sink from side to side to break the seal. b. Pull the release tab out until the heat sink is released. c. Lift the heat sink away from the microprocessor. d. On the retention base, locate the tab opposite the power supply. Press on the retention base tab until the heat sink pops up slightly. e. Press out on the second retention tab while lifting the heat sink up and out of the retention base. 6. Push down and out on the socket release lever. 7. Open the processor cover. CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide. CAUTION: The heat sink can get very hot during normal operation. Be sure that the heat sink has had sufficient time to cool before you touch it. NOTICE: Lay the heat sink down on its side. NOTICE: If you are installing a processor upgrade kit from Dell, discard the original heat sink. If you are not installing a processor upgrade kit from Dell, reuse the original heat sink and blower when you install your new processor. 8. To remove the processor from the socket, lift the processor vertically in one motion. Leave the release lever extended in the release position so that the socket is ready for the new processor. Installing the Processor 1. Unpack the new processor. 2. If the release lever on the socket is not fully extended, move it to that position. 3. Align the pin-1 corners of the processor and socket. 4. Set the processor lightly in the socket and ensure that the processor is level in the socket. When the processor is positioned correctly, press it with minimal pressure to seat it. 5. When the processor is fully seated in the socket, close the processor cover. 6. 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. 7. Install the heat sink: NOTICE: Ground yourself by touching an unpainted metal surface on the back of the computer. 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. 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 process. Be careful not to touch or bend the pins on the system board. NOTICE: If you are not installing a processor upgrade kit from Dell, reuse the original heat sink assembly when you replace the processor. a. Slide one end of the heat sink under the retention tab. b. Lower the heat sink until it fits securely in the module. 8. Lower the airflow shroud over the heat sink. 9. Reconnect the cooling fan power cable to the fan connector on the system board. 10. Reconnect the power cable to the processor power connector on the system board. 11. Close the computer cover. 12. Connect your computer and devices to electrical outlets, and turn them on. Fan Assembly Removing the Fan Assembly 1. Follow the procedures in Before You Begin. 2. Disconnect the AC power cable from the AC power connector on the back of the power supply. 3. Unplug the DC power cables from the drives and system board. 4. Lift up the airflow shroud. NOTICE: Ensure the heat sink is correctly seated and secure. NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it 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 removing the cover. 5. Disconnect the fan power cable from its connector on the system board. 6. Pull the fan release lever away from the back of the computer and slide the fan toward the release lever. 7. Remove the fan assembly from the computer. Replacing the Fan Assembly 1. Align the fan assembly tabs with the holes in the back of the computer. 2. Slide the fan assembly away from the fan release lever until it clicks in place. 3. Reconnect the DC power cables to the drives and system board. 4. Replace the computer cover. 5. Connect the AC power cable to the AC power connector on the back of the power supply. 6. Connect your computer and devices to electrical outlets, and turn them on. System Board Removing the System Board NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer. 1. Follow the procedures in Before You Begin. 2. Remove the floppy drive. 3. Remove any cards that are installed. 4. Disconnect all cables from the system board. 5. Lift up the heat-sink shroud. 6. Remove the microprocessor heat sink. 7. Remove the fan assembly. 8. Remove the 12 screw...