Apparatus for mounting a flat video screen to a support as part of a video wall, in which a frontal viewing surface of said flat video screen extends flush with a frontal viewing surface of each other flat video screen of the video wall, said apparatus comprising first frame means mountable to a rear surface of the flat video screen opposite its frontal viewing surface, second frame means mountable to a wall or other support, and a selectably extensible connection mechanism linking said first and second frame means, said connection mechanism being selectably reconfigurable between: a closed configuration in which the frontal viewing surface extends substantially coplanarly with the frontal viewing surfaces of adjacent flat video screens of the video wall, and: an open configuration in which said flat video screen is displaced significantly outwardly from the video wall, wherein the connection mechanism comprises one or more scissor mechanisms, with the or each scissor mechanism comprising a first and second strut means, connected pivotably together adjacent a respective mid-point of each said strut means (7,8), a lower, in use, end of first strut means being pivotably mounted to the first frame means and a lower, in use, end of the second strut means being pivotably mounted to the second frame means, and an upper, in use, end of the first strut means, remote from said lower, in use, end, is constrained to follow substantially vertical elongate track means of the second frame means, and an upper, in use, end of the second strut means is constrained to follow substantially vertical elongate track means of the first frame means; wherein a biasing element is provided to urge said connection mechanism towards its open configuration; characterised in that the connection mechanism is provided with a damping element associated with at least one of the or each scissor mechanism, said damping element being operatively connected either between the upper end of the first or second strut means and the lower end of the second or first strut means respectively, or between said upper end of the first or second strut means and a fixed point on the second or first frame means respectively. an open configuration in which said flat video screen is displaced significantly outwardly from the video wall, wherein the connection mechanism comprises one or more scissor mechanisms, with the or each scissor mechanism comprising a first and second strut means, connected pivotably together adjacent a respective mid-point of each said strut means (7,8), a lower, in use, end of first strut means being pivotably mounted to the first frame means and a lower, in use, end of the second strut means being pivotably mounted to the second frame means, and an upper, in use, end of the first strut means, remote from said lower, in use, end, is constrained to follow substantially vertical elongate track means of the second frame means, and an upper, in use, end of the second strut means is constrained to follow substantially vertical elongate track means of the first frame means; wherein a biasing element is provided to urge said connection mechanism towards its open configuration; characterised in that the connection mechanism is provided with a damping element associated with at least one of the or each scissor mechanism, said damping element being operatively connected either between the upper end of the first or second strut means and the lower end of the second or first strut means respectively, or between said upper end of the first or second strut means and a fixed point on the second or first frame means respectively.