Enabling multiple monitor support - ThinkCentre Edge 71, Edge 72, Edge 91, Edge 92, E73, M71e, M81, M82, M73, M83, M83p, M91, M91p, M92, M92p, M93, M93p, M700, M800, M900, ThinkStation E30, E31, E32, P300, P310 - US