External widescreen monitor not working properly

Hi! i have an LG Flatron 2243S monitor and i just hooked it up to my late 2011 macbook pro 15" through the mini display port and vga cable since the monitor does not have DVI input, Im having issues with the resolution it shows. if i put it in 1920x1080 60hz it leaves a black space on the left side of the screen. I have it set to 1400x1050 60hz so it fils the screen but it looks streched since i believe that is more of a 4:3 resolution... Can you guys help me?

Well, I think I have solved the problem. One of the external cases apparently was screwing up the works as far as the USB bus was concerned. After removing that unit from the setup, it seems as if everything is back to normal. I now have to test the HDD's to see if either of the two from that particular enclosure have a problem.

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