Apple Xserve Intel (Late 2006) DIY Procedure for Logic Board - Manual (Page 23)

Xserve (Late 2006) Logic Board Replacement Instructions 
Replacing the PCI Riser Cards and Expansion Cards
Align the riser with slot 2 on the logic board and press to seat the card.
Tighten the captive screws that secure the riser bracket to the back panel.
Repeat for the riser in slot 1.
Note: If no risers are installed, install the blanks held in place by the same screws.
Replacing the Power Supplies
Slide the first power supply all the way into the bay, and then press the handle to seat the
power supply and lock it in place.
Slide the power supply in and
press the handle to seat it.
Repeat for the second power supply, if installed.
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