support.dell.com Rack Installation Guide 1-157. Secure the cables to the cable-management arm:a. After connecting the cables to the system, unscrew the thumbscrews thatsecure the front of the server to the front vertical rail.b. Slide the system forward to the fully extended position.c. Route the cables along the cable-management arm, allowing someadditional cable slack at the hinge positions, and secure the cables to thecable-management arm with the Velcro straps attached to the cable-management arm.8. Slide the system in and out of the rack to verify that the cables are routedcorrectly and do not bind, stretch, or pinch with the movement of the cable-management arm.NOTE: As you pull the system out to its furthest extension, the slide assemblieswill lock in the extended position. To push the system back into the rack, pressthe green locking latch on the side of the slide to release the locks, and then slidethe system completely into the rack.Replacing the DoorsThis procedure provides instructions for replacing doors on Dell 24-U and 42-U racks.If you have a Dell PowerEdge 4210 rack, see the procedures contained in theDell PowerEdge 4210 Rack Installation Guide.CAUTION: To prevent personal injury due to the size and weight of thedoors, never attempt to remove or replace the doors by yourself.To replace the 24-U rack’s front and back doors, perform the following steps:1. Lift the front door into position and align the hinges with the hinge insert in therack as shown in Figure 1-4.2. Slide the hinge pins into the hinge insert in the rack until the hinges lock intoposition.3. Verify that the hinges are latched.4. Close the door latch by rotating the handle counterclockwise until it stops (seeFigure 1-2).5. Repeat steps 1 through 4 to replace the back door.To replace the 42-U rack’s front and back doors, perform the following steps:1. Lift the front door into position and align the hinges with the holes in the rack asshown in Figure 1-5.2. Slide the hinges into the holes in the rack until the hinge release levers lock thehinges into position.