Compaq Prolinea Family Maintenance & Serice Manual page 121

System Board Installation
The replacement system board can be installed in the computer by
completing the following steps:
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The system board should have four bumper pads installed on its bottom
side. Verify that the bumper pads are in place before installing the
system board.
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1. Slide the system board all the way in until it touches the backplane
connector.
2. It takes a strong push to seat the system board into the backplane
connector. Raise the base pan and stand it on edge (Figure 5-41) with
the system board on top. In this orientation, the system board can be
pushed into place easily.