Removing the System Cover
Before installing internal components, you must turn off and unplug the computer, and remove the system cover.
To remove the system cover:
1.If the computer is on, turn it off.
2.Unplug the power cord and disconnect any peripheral devices.
3.Loosen the three thumbscrews on the rear of the system (Figure 8). If the screws are too tight to remove by hand, use a
Figure 8. Removing the System Cover
4.Slide the cover back approximately
Upgrading Your Computer 19