A computer enclosure includes a chassis (60) and a hood (10) attached to the chassis. The chassis includes a rear panel (90) defining a slot (91) and a pair of side flanges (71). Each side flange defines a number of cutouts (74) and a number of slits (75) exposed to the cutouts, respectively. The hood has a pair of side walls (30) and a J-shaped catch (40) extending from a rear flange (32) between the side walls. The catch of the hood is received in the slot of the chassis, allowing the hood to be rotatable with respect to the chassis between an open position and a closed position while being selectively removable from the chassis when at the open position. The J-shaped catch engages with the slot for supporting the hood at the open position. Each side wall has a number of latches (31) for being received in the cutouts and moved into the slits of the chassis thereby securely fixing the hood to the chassis when the hood is at the closed position.