I was going to suggest using DVI. If the colours were washed out, then it was most likely that the cable was damaged. DVI is supposedly better than VGA, but most people cannot tell the difference. I use DVI because my monitor requires it to enable certain features. The Digital signal just works better or something like that. I'd say try a different DVI cable before buying osme elaborate piece of hardware. I do exactly what you want to do with my own monitor. DVI comes from Desktop GPU and VGA comes from laptop. I press the source button to switch between the two.
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