IBM x3100 M5 Type 5457 Installation And Service Manual page 328

System board
(7 screws)
Figure 230. System board screw removal for 4U server model with non-hot-swap power
supplies
12. Slightly lift the system board at the side that is near the hard disk drive cage
Figure 231. Slightly lifting system board for 4U server model with non-hot-swap power
supplies
312
System x3100 M5 Type 5457: Installation and Service Guide
to create a small angle of elevation between the system board and chassis.
System borad