Disassembly and Reassembly 3-3
On completion of any reassembly, perform a power-on test. If a fault occurs, verify that the
reassembly was performed correctly.
System Covers
The following sections describe how to remove and replace the following system unit covers:
! system cover
! front panel.

Removing the Cover

Before installing optional hardware inside your system, you must first remove the cover from
the system unit.
Before removing the cover, turn off system power and unplug the
system power cable. Power is removed only when the power cable is unplugged.
1. Turn off and unplug the system u nit.
2. Disconnect any external devices (such as a keyboard and monitor) from the front or rear of
the system unit.
Electrostatic discharge can damage computer components. Discharge
static electricity by touching a metal object before removing the cover.
3. If the system unit is in the upright (minitower) position, place it on its right side (the side
with four rubber feet).
4. If you have a padlock in the locking tab on the rear of the chassis, remove it.
5. Remove the two thumbscrews holding the cover to the rear of the chassis.

Locating the Cover Screws

A – Cover C – Locking Tab
B – Cover Screws
6. Grasp the handle on the cover and slide the cover towards the rear of the chassis about an
inch (see the following figure).
7. Lift the cover off the system and set aside.