Apple Xserve (Early 2008) DIY Procedure for Power Distribution Board - Manual (Page 11)

Xserve (Late 2006/Early 2008) Power Distribution Board Replacement Instructions 11
Replacing the Drive Interconnect Backplane
Lower the backplane into the enclosure at a slight angle (as shown), and carefully align the 1.
front edge of the backplane with the four backplane alignment slots in the enclosure. Be
careful not to let any backplane components come into contact with the standoffs or the
enclosure as you install the backplane.
Rotate the backplane downward and over the four mushroom-shaped standoffs. 2.
Slide the backplane in the direction of the arrow shown to fully seat the backplane in the 3.
enclosure.