IBM Power Systems 9009-41A Manual page 85

Figure 69. Sliding the backplane towards the rear of the system
e) Using a Phillips screwdriver, replace and screw in the four screws (D) that are vertically aligned
and that attach the backplane to the sides of the system chassis. See the following image.
Notes:
• You might find it helpful to use a magnetic screwdriver.
• Do not remove the silver Torx screws.
Figure 70. System backplane screw locations
Removing and replacing the system backplane in the 9009-41A, 9009-42A, or 9223-42H 71