A mounting system for a flat panel display includes a wall interface assembly, a pair of arm assemblies, and a mounting assembly. The wall interface assembly can include a slide plate connected to arm assemblies which enable the arm assemblies and mount assembly to be horizontally shifted without the need to remove the mount from the wall and reattach it. The arm assemblies may be substantially hollow arms having removable covers for storing wires connected to display therein. The mounting assembly can also include a pair of brace arms each having two generally D-shaped members placed back-to-back and slidable relative to each other to enable the mount assembly to be expanded to mount various sized displays without extending beyond the width of the display.