support.dell.comDell PowerEdge 2400 Systems Rack Installation Guide 1-172. Align the bracket on the end of the cable-management arm with the correspond-ing holes on the lower-right corner of the computer’s back panel (see Figure 1-14).Secure the arm using two 8-32 x 0.313-inch Phillips-head screws.3. Connect the cables to the computer.For details, see your computer’sInstallation and Troubleshooting Guide and theUser’s Guide.4. Secure the cables:a. After connecting the cables to the computer, unscrew the thumbscrews thatsecure the front rack adapter to the front vertical rail.b. Slide the computer forward to the fully extended position.c. Route the cables along the cable-management arm, and secure the cablesto the cable-management arm with the Velcro strips attached to thecable-management arm.5. Slide the computer in and out of the rack to verify that the cables are routedcorrectly and do not bind, stretch, or pinch with the movement of thecable-management arm.NOTE: As you pull the computer out to its furthest extension, the slide assem-blies will lock in the extended position. To push the computer back into the rack,press the green locking latch on the side of the rail to release the locks (seeFigure 1-13), and then slide the computer completely into the rack.Replacing the Rack DoorsCAUTION: To prevent personal injury due to the size and weight of thedoors, never attempt to replace the doors by yourself.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 1-4.2. Slide the hinges into the holes in the rack until the hinge release levers lock thehinges into position.3. Verify that the hinges are latched.4. Close the door latch by rotating the handle counterclockwise until it stops, pushin the handle until it locks in position, and then slide the cover down over thepush button (see Figure 1-3).5. Repeat steps 1 through 4 to install the back door.