Desktop not showing xompletely

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I've built myself a hackintosh and recently I've upgraded the OS to Snow Leopard. Since doing so, I can't get the desktop to completely show on my flatscreen. Now, I've got the edges trimmed off so I can't see the toolbar, bottom of the icons in the dock and some of the lateral edges. I'm not quite sure what caused this since my system had no problems with this before. Any clue? I've got a 50" 1080P Samsung plasma I bought in 2009.

Thanks for the help.


Henry