The computer case serves mainly as a way to physically mount and contain all of the actual computer components. Cases typically come bundled with the power supply included.
tower, box, housing, chassis, cabinet
Motherboards, cases and power supplies all come in different sizes called form factors. All three must be compatible to work properly together.
Many computer cases, especially ones made of metal, contain very sharp edges. Be very careful when working with an open case to avoid serious cuts.
When service persons say "Just bring the computer in" they are typically referring to the case and what's inside of it, excluding the keyboard, mouse, monitor and other external peripherals.
The front of the case contains a power button and sometimes a reset button. Small LED lights are also typical, representing the current power status, hard drive activity and sometimes other internal processes. These buttons and lights connect directly to the motherboard which is secured to the inside of the case.
Cases usually contain multiple 5.25 inch and 3.5 inch expansion bays for optical drives, floppy disk drives, hard drives and other media drives. These expansion bays are located at the front of the case so, for example, the DVD drive be easily reached by the user when in use.
At least one side of the case, perhaps both, slide or swing open to allow access to the internal components. For instructions on opening the case, see How to Open a Standard Screw Secured Computer Case.
The rear of the case contains small openings to fit the connectors contained on the motherboard which is mounted inside. The power supply is also mounted just inside the back of the case and a large opening allows for the connection of the power cord and use of the built-in fan. Fans or other cooling devices may be attached to any and all sides of the case.
