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CAUTION: See "Protecting Against Electrostatic Discharge" in the safety instructions in your System Information document. 1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet. 2. Remove the cover (see "Removing the Cover "). If you are installing a second microprocessor, go to step 6. NOTE: The system is designed to allow you to remove the microprocessor heat sink without removing the microprocessor cooling fan. However, you can remove the fan to provide easier access to the heat sink retention clips (see "Removing a Cooling Fan"). 3. Remove the microprocessor heat sink: a. Press down on the heat-sink securing clips to release the clips from the retaining tabs on the ZIF socket (see Figure 4-28). b. Remove the heat sink securing clips. CAUTION: The microprocessor and heat sink can become extremely hot. Be sure the microprocessor has had sufficient time to cool before handling. NOTICE: Never remove the heat sink from a microprocessor unless you intend to remove the microprocessor. The heat sink is required to maintain proper thermal conditions. NOTICE: After removing the heat sink, place it upside down on a flat surface to prevent the thermal interface material from being damaged or contaminated. c. Remove the heat sink. Figure 4-28. Removing and Installing the Heat Sink 4. Pull the socket release lever upward to the fully open position (see Figure 4-29). NOTICE: Be careful not to bend any of the pins when removing the microprocessor. Bending the pins can permanently damage the microprocessor. 5. Lift the microprocessor out of the socket and leave the release lever in the open position so that the socket is ready for the new microprocessor (see Figure 4-29). Figure 4-29. Removing and Installing the Microprocessor 6. Unpack the new microprocessor. If any of the pins on the microprocessor appear bent excessively, return the microprocessor to the system manufacturer. 7. Ensure that the microprocessor socket release lever is in the fully open position. 8. Align pin 1 on the microprocessor (see Figure 4-29) with pin 1 on the microprocessor socket. NOTE: No force is needed to install the microprocessor in the socket. When the microprocessor is aligned correctly, it should drop into the socket. 9. Install the microprocessor in the socket (see Figure 4-29). NOTICE: Positioning the microprocessor incorrectly can permanently damage the microprocessor and the system when you turn on the system. When placing the microprocessor in the socket, be sure that all of the pins on the microprocessor go into the corresponding holes. Be careful not to bend the pins. 10. When the microprocessor is fully seated in the socket, rotate the socket release lever back down until it snaps into place, securing the microprocessor in the socket. 11. Place the new heat sink on top of the microprocessor (see Figure 4-28). 12. Orient the securing clips as shown in Figure 4-28. 13. Hook the end of the clips without the latch to the tab on the edge of the socket. 14. Push down and pivot the securing clip latch until the hole on the clip latches onto the ZIF socket tab. NOTICE: A cooling fan is required for each microprocessor to maintain proper thermal conditions. 15. Ensure that the microprocessor cooling fan is installed: If you removed the microprocessor cooling fan before you removed the microprocessor heat sink, replace the fan. If you installed a second microprocessor, install the fan for the new microprocessor. For information on installing or replacing a cooling fan, see "Replacing a Cooling Fan." 16. If you are adding a second microprocessor, install the VRM in the VRM 2 connector, pushing down firmly to make sure that the latches engage (see Figure 4-30). Figure 4-30. Installing the VRM 17. Replace the cover (see "Replacing the Cover "). 18. Reconnect the system to its electrical outlet and turn the system on, including any attached peripherals. 19. Enter the System Setup program, and ensure that the microprocessor options match the new system configuration (see "Using the System Setup Program "). As the system boots, it detects the presence of the new microprocessor and automatically changes the system configuration information in the System Setup program. If you installed a second microprocessor, a message similar to the following appears: Two 1.8 GHZ Processors, Processor Bus: 400 MHz, L2 cache 512 KB Advanced If only one microprocessor is installed, a message similar to the following appears: One 1.8 GHz Processor, Processor Bus: 400 MHz, L2 cache 512 KB Advanced 20. Confirm that the top line of the system data area in the System Setup program correctly identifies the installed microprocessor(s) (see "Using the System Setup Program "). 21. Exit the System Setup program. 22. Run the system diagnostics to verify that the new microprocessor is operating correctly. See "Running the System Diagnostics" for information on running the diagnostics and troubleshooting any problems t...