Epson EQUITY 3865X/20 PLUS - Manual (Page 120)

3. Lower the back of the cover onto the computer and press
down
firmly on all edges to form a tight seal.
4. Turn the large screw on the back panel clockwise to secure
the cover to the computer.
5. Reconnect the computer to the monitor, printer, keyboard,
and any other peripheral devices you have.
6. Reconnect the power cable to the back of the computer and
to an electrical outlet.
Accessing Internal Components 5-17