Abstract: A door assembly which includes a door that slides open and closed to alternatively expose and cover components of a computer system. The door assembly includes a rack and pinion system that prevents racking of the door. The non-racking feature allows for the door to be wider than prior art doors such that more components may be easily accessed by a computer user. The door assembly also includes a spring assembly for automatically closing the door, a dampener for moderating the movement of the door, and a latching mechanism that holds the door open. In one embodiment the latch mechanism is a push-push latch and the spring of the spring assembly is a constant force spring.