Rack mountable display apparatus is provided for an electronic equipment rack. The apparatus includes a support for the display whereby the display is moveable between a storage position within the rack and a deployed position external to the rack. The display can be in the form of sheets of material supported on a mount, or could be in the form of an electronic display in combination with a processor. The processor could be located within the rack, or could be deployed with the display, for example where the display is part of a portable computer. The display is used to provide maintenance information to a maintenance engineer to facilitate maintenance of the rack mounted equipment.