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2   How to Install and Replace Components In Your Desktop PC
Replacing the System Board
5 First ensure the lever is open, then carefully slide in the new system 
board, aligning the rails and the rear connector bracket correctly. 
6 Pushing on the lever and on the system board edge, slide the system 
board firmly into place. Ensure the connectors are well aligned and 
fully engaged. 
7 Replace the main memory and processor in the new system board 
(described in this chapter).
8 Replace the lower bracket.
9 Replace the cover (described in this chapter).