Right-click it in your library and click properties, click on set launch options and type in -window and try and start it up again. If it's still all black it may have something to do with your graphics card drivers.
Also try out some other source games. See if it does the same.
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When i start-up l4d2 i get a full black screen but i can hear the sounds that come from the game does anyone know how 2 solve this problem ?
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