Abstract: The present invention comprises a computer system housing embodying the invention incorporates a frame upon which the components of the computer system are mounted. The frame has a base, a main unit secured to the frame, and a front compartment, for mounting mass storage unit therein, swingably positioned on the main unit. A housing adapted for supporting a central processor unit and a power supply of the computer system is removable disposed in the main unit. The frame and the housing are provided with all pneumatic connections so that air for cooling various components of the computer system may be brought over such components by the action of a fan mounted on the base. Thus, internally generated heat in such components can be readily dissipated by the air flow over such components. The frame and the housing are adapted so that the components of the computer system positioned therein are accessible with relative ease so that they are installed, replaced, and repaired easily.