Chapter 15: The System Case^345
Single-Screw Cases
Many name brand PCs feature a case that has a single large knobby screw on the back of
the case (see Figure 15-4). This type of case is called “tool-less” because you should be
able to remove or replace the screw with your fingers. The cover pieces are held firm by
spring clips inside the case to apply pressure and hold the cover pieces in place. Like the
legacy cases described earlier, the cover lifts off or slides back and off.
Screwless Cases
On this type of case cover, there are several individual cover pieces, generally one
piece to a side. Typically, the front panel is attached by a spring clip and is pulled up
and lifted off one or more hook-like tabs built into the chassis. After the front panel is
removed, the top is removed, typically by lifting it straight up, and then the sides are
removed, one at a time.
Figure 15-4. A single screw holds on the cover on a single screw case design