IBM Aptiva Handbook page 74

3.
Remove the system unit cover. The cover on the
minitower system unit is attached to the frame
with two screws. It also slides along grooves that
run along the sides of the frame. Follow these
steps:
a.
Remove the screws.
(Back View)
b.
Slide the cover forward and completely
remove it from the system unit.
(Front View)
60 Chapter 5: Preparing to upgrade
4.
Touch the bare metal frame of your system unit to
dissipate the static electricity from your body. Do
not touch any of the components inside the frame
before you touch the frame. Do not touch any
component with a voltage warning label.
5.
Disconnect the system unit power cord.