A collapsible and adjustable support for a computer cabinet is shown. The collapsible support includes a first endpiece, a second endpiece, an elongated guide member connected to and spanning between the first and second endpieces, an elongated toothed rack spanning between the first and second endpieces, a first and a second leg, and a disengagement device adapted for sliding the toothed rack from a first position to a second position relative to the guide member. The guide member includes a first guide recess, and guide pin(s). The toothed rack includes one or more second guide recesses, each adapted for receiving a first guide pin of the guide member, thereby allowing the toothed rack to slide from the first position to the second position relative to the guide member. Each leg includes a foot, a leg part connected to the foot, and a sled connected to the leg part.