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5. Slide the I/O panel backward and remove the I/O panel from the system. Installing the I/O Panel 1. Align the I/O panel with the two securing tabs on the chassis. See Figure 1-3. 2. Slide the I/O panel forward until it stops. 3. Using a #2 Phillips screwdriver, install the screw that secures the I/O panel to the chassis. 4. Connect the following cables: l I/O panel l Chassis intrusion switch l Control panel 5. Close the system. 6. Reconnect the system to the electrical outlet, and turn on the system. Chassis Intrusion Switch Removing the Chassis Intrusion Switch 1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet. 2. Open the system. 3. Disconnect the chassis intrusion switch cable from the switch connector on the I/O panel. See Figure 1-3. 4. Slide the chassis intrusion switch out of the securing bracket notch. See Figure 1-4. Figure 1-4. Removing and Installing the Chassis Intrusion Switch CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge. 5. Remove the switch and its attached cable from the system. Installing the Chassis Intrusion Switch 1. Align the chassis intrusion switch with the securing bracket notch. See Figure 1-4. 2. Slide the switch into the securing bracket notch. 3. Connect the switch cable to the switch connector on the I/O panel. See Figure 1-3. 4. Close the system. 5. Reconnect the system to the electrical outlet, and turn on the system. Memory Cooling Fan and Shroud Installing the Memory Cooling Fan and Shroud 1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet. 2. Open the system. 3. Align the memory cooling fan and shroud tabs with the holes on the back panel. See Figure 1-5. Figure 1-5. Installing the Memory Cooling Fan and Shroud NOTICE: If you install more than 4 GB of memory, you must install the memory cooling fan and shroud to prevent the memory from over heating. If you do not install the memory cooling fan and shroud, you will receive an error message stating that you must install a fan or remove some memory. CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge. 4. Insert the tabs and lower the memory cooling fan and shroud until it snaps into place. 5. Connect the memory cooling fan and shroud power cable to the system board. See Figure 1-5. 6. Close the system. 7. Reconnect the system to the electrical outlet, and turn on the system. Power Supply Removing the Power Supply 1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet. 2. Open the system. 3. Remove the expansion-card guide: a. Pull up on the expansion-card guide release lever. See Figure 1-6. b. Slide the guide toward the power supply. c. Lift the guide out of the system. 4. Disconnect the following power supply cables: l P3 connector for the hard drives. See Figure 1-6. l POWER 1 connector on the system board. l POWER 2 connector on the system board. Figure 1-6. Removing the Expansion-Card Guide CAUTION: See your System Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge. 5. While pressing the power-supply release button, slide the power supply toward the back of the system. See Figure 1-7. Figure 1-7. Removing and Installing the Power Supply 6. While pulling the power supply away from the system, carefully guide the power-supply cables through the hole in the side of the chassis. Installing the Power Supply 1. Carefully guide the power-supply cables through the hole in the side of the chassis. 2. Align the tabs on the power supply with the securing notches in the chassis. See Figure 1-7. 3. Slide the power supply toward the front of the system until it snaps into place. 4. Install the expansion-card guide (see Figure 1-6): a. Align the four expansion-card guide tabs with the securing slots in the chassis. b. Lower the guide into the securing slots and slide the guide away from the power supply until it snaps into place. 5. Connect the following power supply cables (see Figure 1-6): l POWER 2 connector on the system board. l POWER 1 connector on the system board. l P3 connector for the hard drives. See Figure 1-6. 6. Close the system. 7. Reconnect the system to the electrical outlet, and turn on the system. System Board The system board and system board tray are removed and replaced as a single assembly. Removing the System Board 1. Turn off the system and attached peripherals, and disconnect the system from the electrical outlet. 2. Open the system. 3. Disconnect the following cables from the system board (see Figure A-3 in the Installation and Troubleshooting Guide): l Power-supply cable from the POWER 1 connector l Power-supply cable from the PO...