A retention apparatus (hanger) suitable for use with a data processing system that includes a data processing box and a video display is disclosed. The hanger includes a pair of substantially parallel major sides and a pair of substantially parallel minor sides that connect the pair of major sides at their respective ends to define a substantially rectangular aperture suitable for receiving the data processing box. The hanger further includes a hook that has a base portion and a tooth portion connected at an end of the base portion. The base portion extends substantially from and in line with one of the minor sides such that the tooth portion is laterally displaced from one of the major sides with the tooth oriented towards the other minor side. In this configuration the hook enables the hanger to suspend from a groove in the display monitor with the first major side of the hanger in close proximity to a rear face of the video display. The hanger may further include a latch located proximal to the second minor side and in close proximity to the rear face of the display monitor when the hanger suspends from the hook. The latch is preferably enabled to secure the hanger to the video display and may include a tongue affixed to a base piece where the base piece is movably affixed to the hanger such that movement of the hanger base piece when the hanger is in close proximity to the rear face of the display monitor facilitates snapping the tongue into a groove in the rear face of the video display. An extension flange affixed to the latch base piece may facilitate operation of the latch. Cable management means, such as a cable hook, may be affixed to the second major side of the hanger. The hanger may include bumper protrusions to maintain separation between the data processing box and the display monitor when the data processing box is received within the hanger and the hanger is suspended from the groove in the video display.