IBM System x3650 M3 4255 Installation And User Manual page 80

10. Connect one end of the internal power cable that comes with the 4 Pac HDD
11. Remove hard disk drive backplane from the server.
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System x3650 M3 Types 4255, 7945, and 7949: Installation and User's Guide
9. Remove the SAS controller front retention bracket from the server.
upgrade option kit into the hot-swap SAS/SATA power connector on the system
board.