Abstract: A retaining frame for components of a personal computer comprises a horizontal portion, with a first section and a second section connected together; and a vertical portion attached substantially perpendicular to the first and second sections. The first section is adapted to secure a disk drive holder, and has at least one leg extending downward to support the retaining frame. The second section is adapted to secure a power supply, and has at least one leg extending downward to support the retaining frame. The vertical portion comprises a speaker seat and a ventilation fan seat at a central location near the first section, and speaker securing rib and fan securing device, respectively, for fastening a speaker and a ventilation fan. The retaining frame with a disk drive holder, power supply, speaker and the ventilation fan mounted thereon is disposed on the lower portion of a computer case, and secured inside the case by a vertical force exerted on the retaining frame by an upper portion of the computer case.