Replacing the Subassembly
Follow these steps to replace the subassembly:
1.Turn the computer so you are facing the front panel.
2.Hold the subassembly at a slight angle and guide the front of it down through the opening in the front of the computer, as shown below.
3.Fit the two holes in the lower front of the subassembly over the two posts on the front of the computer case, as shown above.