Viewsonic 390Fb Dimming Problem

As the title reads; my monitor becomes very dim loseing most of its gamma/brightness. The monitor is going on two years old of constant use. Does this mean that my monitor is starting to go out on me? It usualy does this after it has ben on for long peroids of time. The monitors brightness is set to minimum and the gamma that the video controls is set at a moderate setting. Im not sure of what it is, but could it be my video card too? (9700 pro, same age of monitor)

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