Abstract: An enclosure (10) of a computer includes a U-shaped frame (12) consisting essentially of a front panel (14), a rear panel (16) and a bottom panel (18) therebetween, commonly defining therein a rectangular parallelepiped space for receiving therein the components such as the mother board, the drive and the power supply (64), etc. Two side panels (30) are attached to the frame (20). A top cover (40) is slid unto the top of the frame (12) with a locking device (42) for releasably securing the top cover (30) with regard to the frame (12), thereby allowing easy inspection and repair of the defective internal components. The frame (12) further includes a securement plate (76) with a plurality of grounding fingers (78) thereon for retaining the switch power supply (64) in position. A number of grounding fingers (84) are provided on the top edge of the rear panel (16) of the frame (12) corresponding to the fingers (78) of the securement plate (76), thereby providing the power supply (64) with superior grounding.