Dell DX6004S Hardware Owner's Manual page 118

1 Disconnect the power cable from the power source.
2 Disconnect the power cable from the power supply and remove the Velcro
straps that bundle and secure the system cables.
NOTE:
it interferes with power-supply removal. For information about the cable
management arm, see the system's rack documentation.
3 Press the release latch and pull the power supply straight out to release it
from the power distribution board and clear the chassis.
Figure 3-18. Removing and Installing a Redundant Power Supply
1 power supply
3 power supply handle
118
Installing System Components
You may have to unlatch and lift the optional cable management arm if
1
2
2 release latch
3