Epson EISA Desktop - Manual (Page 72)

5. Lower the back end of the subassembly into the computer.
If necessary, align the post beneath the back right edge of
the subassembly with the hole on the top of the power
supply. Then lower the subassembly all the way down.
6. Gather the power supply and drive cables and place them in
the clasps on the side of the subassembly, as shown below.
Snap the clasps shut.
Accessing Internal Components 4-9