Lenovo ThinkStation P520 Hardware Maintenance Manual page 208

8. Install the new system board into the chassis by aligning the 11 screw holes in the new system board
with the corresponding mounting studs on the chassis. Then, install the 11 screws in the sequence as
shown to secure the new system board.
Figure 178. Installing the 11 screws to secure the system board
9. Reinstall all parts that you have removed one by one in the reversed sequence as you remove them.
Refer to the information that you have noted down and the related topics in Chapter 9 "Hardware
removal and installation" on page 103.
10. Connect all cables to the new system board. See "Parts on the system board" on page 42.
11. Connect the external cables and the power cord to the computer.
The failing system board must be returned with a microprocessor socket cover to protect the pins during
shipping and handling. Install the microprocessor socket covers removed from the new system board on the
failing system board.
To install the microprocessor socket cover, do the following:
Note: Your microprocessor socket and cover might look slightly different from the illustration.
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P520 Hardware Maintenance Manual