Dell POWEREDGE C6105 Hardware Owner's Manual page 101

1 Turn off the system, including any attached peripherals, and
disconnect the system from its electrical outlet.
2 Open the system. See "Opening the System" on page 97.
3 Remove the power supply. See "Removing and Installing a Power
Supply" on page 67.
4 Disconnect all the cables from the first power distribution board. See
Figure 5-12.
Note the routing of the cable underneath the tabs on the chassis as you
remove them from the system. You must route these cables properly
when you replace them to prevent the cables from being pinched or
crimped.
5 Remove the screws securing the first power distribution board to the
system. See Figure 3-22.
6 Lift the power distribution board out of the system. See Figure 3-22.
NOTE: To remove the second power distribution board that is below the first
power distribution board, remove the power distribution board connector
and angle the board before lifting.
Installing System Components | 101