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See Figure 1-2. 4. Reconnect all power cables to the system board power connectors and to their retainer clips, and the power cables from the SATA hard drives or SCSI backplane, diskette drive, CD drive, and any other installed drive. 5. Reinstall the baffle/back fan assembly. 6. If the system is a tower, stand the system upright. 7. Close the system. 8. Reinstall the bezel. Control Panel Removing the Control Panel 1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet. 2. Remove the bezel. 3. Open the system: a. Loosen the three thumbscrews on the left-side cover. b. Grasp the cover at both ends and slide it toward the front of the system. c. Lift the cover away from the system. 4. If a 5.25-inch drive is installed in the peripheral drive bay, remove it. If that drive bay is empty, remove the chassis drive insert that covers the opening of the empty bay. 5. Open the control panel/chassis-intrusion switch cable retainer clip located below the peripheral drive bay. See Figure 1-3. 6. Remove the three screws securing the control panel to the front of the system. See Figure 1-3. 7. Disconnect the control panel and chassis-intrusion switch cables from the back of the control panel. Figure 1-3. Removing and Installing the Control Panel Installing the Control Panel 1. Connect the control panel and chassis-intrusion switch cables to the back of the control panel. 2. Replace the three screws to secure the control panel to the front of the system. 3. Place the control panel and chassis-intrusion switch cables in the cable retainer clip, remove the cable slack between the clip and the control panel, and then close the clip. See Figure 1-3. 4. If you removed a 5.25-inch drive in step 4 of the previous procedure, reinstall the drive. If you removed the chassis drive insert in step 4 of the previous procedure, reinstall the insert. 5. If the system is a tower, stand the system upright. 6. Close the system. 7. Reinstall the bezel. CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge. SCSI Backplane Removing the SCSI Backplane 1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet. 2. Remove the bezel. 3. Open the system: a. Loosen the three thumbscrews on the left-side cover. b. Grasp the cover at both ends and slide it toward the front of the system. c. Lift the cover away from the system. 4. If your system is configured as a tower, lay the system on its right side. 5. Remove the baffle/back fan assembly. 6. Remove the SCSI hard drives from the drive bays. 7. Remove the power and interface cables from the SCSI backplane connectors. 8. Remove the four drive-cage retention screws on the front panel and remove the drive cage. 9. Loosen the SCSI backplane-retention thumbscrew. See Figure 1-4. 10. Slide the SCSI backplane to the right and then lift the backplane away from the drive cage. Figure 1-4. Removing and Installing the SCSI Backplane Installing the SCSI Backplane 1. Insert the six securing tabs on the drive cage into the six securing tabs on the SCSI backplane. 2. Slide the SCSI backplane to the left until it stops. CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. See your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against electrostatic discharge. 3. Tighten the SCSI backplane-retention thumbscrew. 4. Replace the drive cage and secure it with the four drive-cage retention screws. 5. Replace the power and interface cables to the SCSI backplane connectors. 6. Replace the SCSI hard drives into the drive bays. 7. Replace the baffle/back fan assembly. 8. If the system is a tower, stand the system upright. 9. Close the system. 10. Reinstall the bezel. System Board Removing the System Board 1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet. 2. Remove the bezel. 3. Open the system: a. Loosen the three thumbscrews on the left-side cover. b. Grasp the cover at both ends and slide it toward the front of the system. c. Lift the cover away from the system. 4. If your system is configured as a tower, lay the system on its right side. 5. Remove the baffle/back fan assembly. 6. Remove the expansion cards. 7. Remove the expansion-card guide and the front fan. 8. Disconnect all cables from the system board. 9. Remove the memory modules. 10. Remove the heatsink(s) and microprocessor(s). 11. Remove the four drive-cage retention screws on the front panel and remove the drive cage. 12. Loosen the system-board retention thumbscrew located on the back panel. See ...