Dell OptiPlex 5260 Service Manual page 90

2 To replace the I/O board shield:
a Place and align the screw slots on the I/O board shield to the slots on the display assembly base [1].
b Replace the two screws (M3x5) that secure the I/O board shield to the display assembly base [2].
c Route the headset port cable, I/O board cable, and I/O board power cable through the routing guides on the display assembly
base [3].
d Connect the I/O board cable, I/O board power cable, and headset port cable to the system board [4].
90 Removing and Installing components