IBM System x3550 M4 Installation And Service Manual page 306

Figure 181. Backplane installation
10. Turn on the peripheral devices and the server.
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IBM System x3550 M4 Type 7914: Installation and Service Guide
a. Insert the hard disk drive backplane into the slots on the backplane
bracket and push the hard disk drive backplane down until the backplane
is fully seated.
5. Connect the signal, power and configuration cables to the system board. Route
the signal cable from the drive backplane along the chassis and connect it to
the SAS/SATA controller connectors. Then, route the power cable and the
configuration cable from the drive backplane along the chassis and connect it
to the SAS/SATA power connector and SAS/SATA configuration connector.
See "Cabling backplane" on page 199 for more information.
6. Reinstall the hard disk drives (see "Replacing hot-swap hard disk drives" on
page 219).
7. Install the cover (see "Replacing the cover" on page 209).
8. Slide the server into the rack.
9. Reconnect the power cords and any cables that you removed.