Contents 3Contents1 Technical Overview . . . . . . . . . . . . . . . . . . 7Inside View of Your XPS One™ A2420 Computer . . . . . 72 Before You Begin . . . . . . . . . . . . . . . . . . . . 9Recommended Tools . . . . . . . . . . . . . . . . . . . . 9Turning Off Your Computer . . . . . . . . . . . . . . . . . 9Safety Instructions . . . . . . . . . . . . . . . . . . . . . 93 Replacing the Computer Cover . . . . . . . . 114 Replacing the Stand . . . . . . . . . . . . . . . . 135 Replacing the Top Shield . . . . . . . . . . . . . 156 Replacing Memory Module(s) . . . . . . . . . 177 Replacing Drives . . . . . . . . . . . . . . . . . . . 19Replacing the Hard Drive . . . . . . . . . . . . . . . . 19Replacing the Optical Drive . . . . . . . . . . . . . . . 21