Lenovo ThinkCentre A58 User Manual - Page 154

b. Insert the tabs 1 of the socket cover into the hinged side of the socket, and then press the other side of the socket cover downward until the tabs 2 snap into position. Figure 61. Tabs on the microprocessor socket cover (bottom view) Figure 62. Installing the microprocessor socket cover 12. Install the new system board into the chassis by aligning the four mounting studs in the chassis with the corresponding holes on the new system board, and then carefully slide the new system board in to the chassis until it is secured in place by the four mounting studs. 13. Install the heat sink and fan assembly retainer by aligning the four screw holes on the retainer with the corresponding holes on the new system board, and then tighten the screws to secure the retainer on the new system board. 14. Install the heat sink and fan assembly on the new system board. See "Replacing the heat sink and fan assembly" on page 142. And connect the heat sink and fan assembly cable to the new system board. See "Locating parts on the system board" on page 129. 15. Install all memory modules and adapter cards removed from the failing system board on the new system board. 16. Reinstall the hard disk drive. See "Replacing the hard disk drive" on page 136. 17. Reconnect the power and signal cables to the hard disk drive. 18. Reconnect all remaining cables to the new system board. See "Locating parts on the system board" on page 129. 19. Go to "Completing the FRU replacement" on page 155. 148 Hardware Maintenance Manual